Soft durable nylon bristles on the brush which are sponge-free for hygienic cleaning Specially-designed nipple cleaner with half head flexible brush design for thorough 360 degree cleaning. Soft wire-free Dura-tip nipple and spout cleaner effectively removes residue without causing damage. Universal brush size makes it suitable for most wide-neck bottles and nipples and the non-slip handle provides comfort. Extra-wide brush for hard-to-clean areas. Always BPA-free for ultimate reassurance.