Rainbow Bristle Mirrored Hairbrush Rainbow Bristle Mirrored Hairbrush, the portable size brush that fits into her handbag. Perfect when on the go, this metal rainbow brush even comes with a mirror on the back and bonus 2 snag-free hair elastics around the handle. The brush features unique S-shaped rainbow bristles which are great for girls with fine hair due to their volumizing properties. They also help detangle and prevent tangled hair.