The contigo brush set makes cleaning travel mugs, water bottles and kid's cups easier. this 3-piece set is compatible with all contigo products. it contains an ergonomically-designed bottle brush for cleaning both stainless steel and plastic bodies. this bottle brush is excellent for cleaning narrow neck water bottles, helping you reach the hard to clean corners. the straw brush helps push out any dirt or build-up in the autospout products' straws. the dual-sided lid brush features flexible brush heads for cleaning the drink spouts and undersides of both autoseal and autospout lids. all three brushes are top-rack dishwasher safe.