The Reflective Slap Bracelet use durable steel plate insert, easy flap on wrist the band will automatically slap around. Cover with reflective PVC to create the visibility in dark environment. Reflective slap bracelets, just an easy flap on your wrist the band will automatically roll on. Even your 3 year old kid can use it easily. Good for Night Run, Night Cycling, Night Working. You may put it on your wrist/ foot, hang on the bike, backpack or scooter. Helping you to be seen and avoid the accident from happen. Excellent choice of atmosphere gadget and giveaway on night concert, school event, night show, kids event. Available sizes 11.81*1.18 inch 、15.74*1.18 inch、Customized, good for wristband or foot ring.