This Brava elastic strip is used to hold the base plate in place for added security and longer wear time. It's designed to keep your motherboard securely in place while allowing you the freedom of movement it achieves through its elasticity; So whether you're reaching for something on the top shelf or bending over to tie your shoe, you can be sure the strap will move with your body and keep your gadget securely in place, making it easy to wear. it can mean better safety and longer usage time for your appliance. 5.5 inches long; packaging: a box of 20 strips