Description Made of premium material for long lasting use. Tensioner springs are effective way to get rid of the problems with adjusting correct tension in your DIY 3D printer. Suitable for 6 mm synchronous belt. Features - ColorSilver.- Material: Steel.- Size: About 0.8x0.8x1cm- Made of premium material for long lasting use.- GT2 Tensioner Spring. It fits for 3D printer timing belt system.- Fits for the belt width: Less than or equal to 6mm.- Note: The color of the item may vary slightly due to photography.- Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you Packing list: 20 x Tensioner springs