diff --git a/src/Resources/Pieces.php b/src/Resources/Pieces.php
index 875e392..1b7b9b7 100644
--- a/src/Resources/Pieces.php
+++ b/src/Resources/Pieces.php
@@ -5,21 +5,11 @@
 class Pieces extends BaseResource
 {
     /**
-     * @var \Mvdnbrk\DhlParcel\Resources\Piece[]
-     */
-    protected $pieces;
-
-    /**
-     * Create a new Pieces resource.
+     * The piece items in this collection.
      *
-     * @param array $attributes
+     * @var \Mvdnbrk\DhlParcel\Resources\Piece[]
      */
-    public function __construct($attributes = [])
-    {
-        $this->pieces = [];
-
-        parent::__construct($attributes);
-    }
+    protected $items = [];
 
     /**
      * Set the pieces.
@@ -29,24 +19,24 @@ public function __construct($attributes = [])
     public function setPiecesAttribute($pieces)
     {
         foreach ($pieces as $piece) {
-            $this->addPiece($piece);
+            $this->add($piece);
         }
     }
 
     /**
-     * Add a piece.
+     * Add a piece item to this collection.
      *
      * @param  \Mvdnbrk\DhlParcel\Resources\Piece|array  $value
      */
-    public function addPiece($value)
+    public function add($value)
     {
         if ($value instanceof Piece) {
-            $this->pieces[] = $value;
+            $this->items[] = $value;
 
             return;
         }
 
-        $this->pieces[] = new Piece($value);
+        $this->items[] = new Piece($value);
     }
 
     /**
@@ -56,7 +46,7 @@ public function addPiece($value)
      */
     public function toArray()
     {
-        return collect($this->pieces)
+        return collect($this->items)
             ->whenEmpty(function ($collection) {
                 return $collection->push(new Piece);
             })
diff --git a/tests/Unit/Resources/ParcelTest.php b/tests/Unit/Resources/ParcelTest.php
index bd2a7c4..2db3067 100644
--- a/tests/Unit/Resources/ParcelTest.php
+++ b/tests/Unit/Resources/ParcelTest.php
@@ -66,9 +66,9 @@ public function create_a_new_parcel()
         $this->assertEquals('Doe', $parcel->recipient->last_name);
         $this->assertEquals('Test Company B.V.', $parcel->sender->company_name);
         $this->assertEquals('Test 123', $parcel->options->label_description);
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $parcel->pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $parcel->pieces->pieces[0]->quantity);
-        $this->assertEquals(1, $parcel->pieces->pieces[0]->weight);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $parcel->pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $parcel->pieces->items[0]->quantity);
+        $this->assertEquals(1, $parcel->pieces->items[0]->weight);
         $this->assertSame(true, $parcel->options->only_recipient);
         $this->assertSame(true, $parcel->options->signature);
     }
@@ -215,10 +215,10 @@ public function it_can_set_the_pieces_by_passing_a_pieces_object()
             'pieces' => $pieces,
         ]);
 
-        $this->assertInstanceOf(Piece::class, $parcel->pieces->pieces[0]);
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $parcel->pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $parcel->pieces->pieces[0]->quantity);
-        $this->assertEquals(1, $parcel->pieces->pieces[0]->weight);
+        $this->assertInstanceOf(Piece::class, $parcel->pieces->items[0]);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $parcel->pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $parcel->pieces->items[0]->quantity);
+        $this->assertEquals(1, $parcel->pieces->items[0]->weight);
     }
 
     /** @test */
diff --git a/tests/Unit/Resources/PiecesTest.php b/tests/Unit/Resources/PiecesTest.php
index 4089008..2598a90 100644
--- a/tests/Unit/Resources/PiecesTest.php
+++ b/tests/Unit/Resources/PiecesTest.php
@@ -21,9 +21,9 @@ public function creating_a_new_pieces_resource_with_array()
             ],
         ]);
 
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $pieces->pieces[0]->quantity);
-        $this->assertEquals(1, $pieces->pieces[0]->weight);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $pieces->items[0]->quantity);
+        $this->assertEquals(1, $pieces->items[0]->weight);
     }
 
     /** @test */
@@ -35,8 +35,8 @@ public function creating_a_new_pieces_resource_with_array_of_piece_objects()
             ],
         ]);
 
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $pieces->pieces[0]->quantity);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $pieces->items[0]->quantity);
     }
 
     /** @test */
@@ -44,10 +44,10 @@ public function it_can_add_a_new_piece_object()
     {
         $pieces = new Pieces;
 
-        $pieces->addPiece(new Piece);
+        $pieces->add(new Piece);
 
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $pieces->pieces[0]->quantity);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $pieces->items[0]->quantity);
     }
 
     /** @test */
@@ -55,15 +55,15 @@ public function it_can_add_a_new_piece_with_an_array()
     {
         $pieces = new Pieces;
 
-        $pieces->addPiece([
+        $pieces->add([
             'parcel_type' => Piece::PARCEL_TYPE_SMALL,
             'quantity' => 1,
             'weight' => 1,
         ]);
 
-        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->pieces[0]->parcel_type);
-        $this->assertEquals(1, $pieces->pieces[0]->quantity);
-        $this->assertEquals(1, $pieces->pieces[0]->weight);
+        $this->assertEquals(Piece::PARCEL_TYPE_SMALL, $pieces->items[0]->parcel_type);
+        $this->assertEquals(1, $pieces->items[0]->quantity);
+        $this->assertEquals(1, $pieces->items[0]->weight);
     }
 
     /** @test */