Feature:1. Roller Bearing Design: Rotate the arrow and observe the dynamic of the arrow to see the straightness of the arrow, the arrow with high straightness rotates smoothly, and the arrow with low straightness does not rotate smoothly2. Main Function: Check arrow straightness, correctly detect the balance straightness of your arrow, nock alignment, vane and feather balance, to ensure accuracy when shooting.3. Aluminum Alloy Material: Arrow straightness detector is made of high quality aluminum alloy material, high hardness and good strength, ensuring the long service life.4. Wide Range of Applications: Arrow straightness tester is suitable for arrows of various diameters to test the straightness of arrows. Size is 30x6x1.5cm / 11.8x2.4x0.6in.5. Good Workmanship: Small and light, durable, information parameters are clear at a glance. Adopting exquisite workmanship, beautiful appearance design.Specification:Item Type: Arrow Straightness DetectorProduct Material: Aluminum AlloyProduct Size: Approx. 30x6x1.5cm / 11.8x2.4x0.6inColor: As Pictures ShownWeight: Approx. 552g / 19.5oz.Package List:1 x Aluminum Plywood2 x Tester