Place the longer end inside the bottle, squeeze the handle and presto - you're cleaning both the inside and outside at the same time. Talk about multi-tasking.Handle and bristles are made with recycled plasticWire is made from recycled stainless steelHangs on faucet to dryErgonomic, flexible handle10" tall to reach to the bottom!Great for reusable water bottles, travel coffee mugs, baby bottles and more!Patent Pending