Toilet Brush and Holder Set for Bathroom, Flexible Silicone Bristles. The flat brush head can be bent to fit the angle of the rim perfectly, reaching under the rim. The tip of the brush head is designed to clean the edge of the toilet bowl better by bending the brush head upward. Ventilation Slots Base: The interior of the holder is a drip slot to achieve a better drain. No ponding water leaks from the bottom of the base