Elastics Latex Rubber Bands. For Dental Orthodontic. These elastics are the highest quality elastic on the market. 3.5OZ 5.0OZ 6.5OZ. ● 3.5 OZ :(1/4″) 3.5 OZ-Fox; (1/8″) 3.5 OZ-Chipmunk; (3/16″) 3.5 OZ-Rabbit; (5/16″) 3.5 OZ-Penguin; (3/8″) 3.5 OZ-Monkey.