I'm not quite sure what to call it, and it's a prototype so it's made with what ever I had on hand, and using far more glue than I'd care to admit. The elastic is from theraband, each strap is made up of two layers cut to 5/8" width

IMPORTANT: the target is on the inside of a door, the DOOR IS LOCKED, don't do this unless you have no other choice of target position and the door has a lock