ANTI-SNAP PROMISE FOR WORRY FREE FITNESS BAND TRAINING: Our Team At Tribe Fitness Has 10 Years Of Experience Manufacturing Silicon Elastic Band Products. These Stretch Bands Are Made Of A Extra Thick High-Grade Silicon That Will Not Dry Out Snap Or De-Form. COMBINABLE STRENGTH: These Strength Bands Are Stackable Up To 80 lbs. Whether You Are A Seasoned Professional Or Just Starting Out The Tribe Resistance Training Set Has A Metal Multi-Clip System For Almost Any Combination Of Intensity From 5 lbs To 80 lbs.