Durable and practicalRound tooth profile guarantees that the belt tooth fits smoothlyGT2 Pulley and GT2 Belt are used together,very convenient to use20 Teeth contact with the belt, that minimizes the chance of the belt slippingAccurate transmission, without slipping at work, having a constant gear ratioHigh transmission efficiency, energy-saving effect,Designed specifically for linear motionDamping capacity, low noiseEasy maintenance, no lubricantsSuitable For: 3D Printer Parts RepRap PrusaSpecifications:GT2 Belt:1. Length:5m/196.85''2. Width:6mm/0.23''3. Material:Rubber4. Color:Black5. Pitch:GT2GT2 Pulley :1. Diameter:16mm/0.62''2. Diameter of Hole:8mm/0.31''3. Height:16mm/0.62''4. Teeth:205. Material:Aluminum6. Color:SilverTensioner:1. Diameter:16mm/0.62''2. Diameter of Hole:5mm/0.19''3. Height:8mm/0.31''4. Teeth:205. Material:Aluminum6. Color:SilverPackage include:1 x 5m GT2 Belt1 x?20T 5mm Tensioner1 x?5mm Tensioner8 x 20T 8mm GT2 Pulley1 x Wrench(As Pictures)Note:Please allow 1-2mm errors due to manual measurementItem color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.