nc fit simplify resistance loop exercise bands with instruction guide and carry bag, set of 5 training challenge advanced stage of small fitness products n\c would you like to have the most versatile and effective fitness belt on the market? this small fitness product is perfect for you.- sports- keep fit- injury recovery- body shaping- to lose weight- physical therapywhat's the difference between our products? first of all, our resistance loops are made of pollution-free, odorless, and environmentally friendly tpe materials (not easily broken). they are more powerful, able to stretch a dozen more, and you will feel the same resistance to skin mildness and increased durability.secondly, our resistance ring is comfortably equipped with portable bags, easy to store and keep, and equipped with operating instructions, easy to operate. finally, there are 5 different colors: green, blue, yellow, red, and black. you can use different colors to bring you different experiences, so that you can enjoy the fun of sports.the difference between our resistance zones?this resistance band is rigorously tested against buckles, stretching and sweat resistance.you have five resistance bands that you can combine to find the ideal resistance.these straps are very light and suitable for travel and fitness equipment and can be used anytime and anywhere!it makes a great holiday gift for both men and women.