We really had a hard time finding these - and then, there they were! These white elastics have barbs on either end. Designed to hold on a party hat or a mask, we're sure you'll find many more uses. Each elastic measures 10 inches from barb to barb.
To use them, simply create a tiny hole on either side of the mask or hat (or whatever) and feed the barb through the hole. Then, repeat on the other side. The stretching effect of the elastic will reposition the barb to lay flat - holding the end in place - so much more effective than a knotted end!