Telesin Helmet Chin Mount Plus J Hook
 
Helmet mount strap for GoPro, Xiaomi Yi action cameras and other action cameras that use a similar mount. You can attach this adapter to the chin of your motorbike helmet, making it easier to record without having to hold the camera continuously while doing motorbike stunts.
This mount is made of thick plastic so it is not easily damaged or broken.
 
In the box : 
1 x Telesin Motorcycle Helmet Chin Mount for Gopro
1 x J hook Mount