Features Premium Metal Material: The timing pulley adopts high quality aluminum, excellently machined, finished smoothly. Different Sizes: There are toothed or toothless 2GT timing pulleys in different sizes that you can choose. Package Includes: Comes total 5pcs belt pulleys in one bag which you may use for many projects. Perfect Choice: The timing pulley is perfect choice for building a 3D printer or similar projects. Good Replacement: They are good replacement parts for old or broken 3D printer belt pulley. Specifications: Material: Aluminum Model: 2GT(GT2) Tooth Pitch: 2mm Type(Optional): Belt Width Bore Size Tooth 6mm 3mm 16T,Toothless 6mm 3mm 16T,Toothed 6mm 3mm 20T,Toothless 6mm 3mm 20T,Toothed 6mm 5mm 20T,Toothless 10mm 5mm 20T,Toothed Quantity: 5pcs Package Includes: 5 x Pulleys Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List