Natural flow. Combination sponge and bristles for thorough cleaning. Grooved no-slip handle for easy grip. Chevron channels at base for cleaning nipples. Suction storage clip to keep brush near the sink. Note: This Dr. Brown's Bottle Brush is top-rack, dishwasher safe. Wash all parts prior to use. drbrownsbaby.com. www.drbowns.co.uk. BPA free. Made in China.