The Knuckle Strap is made of premium environmentally friendly Minifiber plastic, it is non-slip, and comfortable,enhance game fun The Presscontroller and the anti-throw palm Strap are firmly fixed by a Buckle strip, The tightness is adjusted according to the size of each person's own palm.Also it can be used with the strap , adding extra protection and more stability in using the controllers. You can tie the rubber ring to the grip, and the other way is to use the rubber loop on controller circle, it is more convenient to use the buttons Hand strap with wear- Rubber Loop,which can add better immersions while in VR experience, also provides a better protection for your controllers Material: PU Leather + ABS colour:black Package Contents: 2 * pair Knuckle Strap Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.