This is the Riffe Bulk Power Band SOLD BY THE FOOT Features: RIFFE's Power Bands are made of Gorilla Rubber" Contains antioxidants for longest life. Keep stored in an air tight, dark, cool environment. RIFFE's Power Bands are made of "Gorilla Rubber", the highest modulus power band material available as tested. Contains antioxidants for longest life. Keep stored in an air tight, dark, cool environment.