Material: made of soft silicone, durable, bright color is not easy to fade, which can serve you for a long time .Color: purple, yellow, green, blue, orange, pink, each color 1pc, different colors allow you to identify and carry different essential oils .How to use: simply loop the adjustable strap around your purse strap, belt loop, etc and push down through the hole, then tighten by pulling the strap up to the next adjustment ball, it is a great way to protect your essential oil bottles while giving you the freedom to carry them with you wherever you go .Size as picture shown, silicone with elastic, suit for most 10ml roller bottles