Stable and reliable: using high-quality materials, stable connection, safe and reliable, small and compact appearance, and portable: the design is small and light, does not occupy too much, It has a lot of space and is easy to put in daily backpacks, suitcases, etc. It is very suitable for travel and business trips. The product has superior performance, is easy to carry and simple to install. Product name: 1:3 reduction drive pulley Size:200 x 8 x 8mm Material: Aluminum alloy colour: silver Package Contents: 2 x 2GT 20 Teeth 5mm Bore Synchronous Wheel 2 x 2GT 60 Teeth 5mm Bore Synchronous Wheel 2 x Length 200mm Width 6mm Belt Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.