1. 18 different sizes of strap spring bars, including 8-25mm
2. Stored in a transparent plastic box, different sizes are stored separately, easy to access
3. Material: stainless steel
4. Length: 8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25mm
5. Weight: 51.3g/box of 180 roots, 63.2g/box of 270 roots, 74.5g/box of 360 roots
6. Tube thickness: about 1.5mm
7. Box size: about 11x6.5x1.5 cm/box