Features 1、High Accuracy: The compound bow tuning and mounting string level can help you adjust the position of the bow string or arrow, so that the bow string can be horizontally centered. 2、Wide Applicability: Slot is 8.5mm, and any arrow within 8mm can be usedThe bow level is useful tackle for archery lovers. And greatly improve the shooting accuracy. 3、Easy to Use: Just hang the lever on the string or arrow and see whether the air bubble is between the lines,checks vertical and horizontal position of bow for nock and sight. 4、ABS Plastic: The archery bow tuning and mounting string level is made of premium ABS plastic, which is sturdy and durable, and is not easy to crack after long use. 5、Portable: The compound bow tuning and mounting string level are easy to carry and store, and you can save space just by putting it in the archery bag. Specification Item Type: Archery Level Combo Material: ABS Plastic Gross Weight: 23g / 0.8oz Applications: Slot is 8.5mm/0.33in, and any arrow within 8mm can be used Package List 2 x Arrow Bow Level