Features: Plastic material, and not easy to wear Double-sided scale, clear scale Easy to operate, the string is stable and not easy to fall off To measure the bow stop and improve accuracy, place the T ruler on the deeper part of the push hand and measure the distance to the bow string. The distance is about 22.5-25cm. The larger the bow stop, the slower the arrow speed; the smaller the bow stop, the faster the arrow speed (it is not recommended to be too small, as it is easier to shoot the bow) Specifications: *Product Name: Plastic T ruler *Material: plastic *Size:33*10.4*1cm *Color: orange Weight: 37g Packing weight: 45g Packing size: 40*12cm Package Content: x Plastic T ruler Note: . The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.