The SAFEST & MOST PORTABLE RESISTANCE BAND SET on Amazon.com. Resistance band, due to its nature will eventually breaks. Once it breaks ALL OTHER SINGLE BAND will snap / recoil back & hurt you. Our patented X-Safe technology DOESN"T. It"s also the most portable one. For single band, you can immediately exchange from one tension to another; for set, you can exchange the band to get different resistance levelDon"t get yourself or your love ones hurt by using unsafe bands! All the bands measure 48 inches, and include cushioned foam handles to ensure a secure, comfortable grip.