Description:Fit for Reprap, Prusa, MendelMax,3D PrinterIt Gives Better Smoothness and Cccuracy of PositioningCircular arc Tooth Profile Tooth Space is Small, Suitable for Straight Line Driving20 Teeth contact with the belt, that minimizes the chance of the belt slippingsGT2 pulley with 20 teeth or grooves is one of choices for 3d printer constructionSpecification:Timing belt material: RubberTiming belt Length: 5mTiming belt width: 6mmPulley wheel material: AluminumPulley wheel Teeth: 20TPulley wheel Board: 5mmPackage Includes:1 Piece 5m GT2 timing blet5 Pieces 20T timing pulley1 Piece Hexagon wrench