This is a band for securing brackets for bicycle headlights, etc. It is 6cm long, and stretches to about 10cm. It's smaller than standard ones, so it's suitable for situations where standard ones might slip. Search terms: RIDERACE Bike Rubber Mount Band Bicycle Headlight Rear Lamp Handlebar LED Torch Holder Mounting Parts Light Strap Small Holder Ring Fixing Band Safety Band Light Holder