Strong and durable - injection molded of high-impact, chemically resistant polypropylene ergonomically designed for comfort and quality seat bumpers are molded-in for extra strength and durability, never need replacing ultra-violet protection molded into each seat to prevent color fading simply to install - only requires a screwdriver, release ' clean adjustable hinges for a perfect fit, corrosion-proof, self-aligning hardware snap hinge caps up to easily slide seat off mounting hardware for ease of cleaning the toilet. Easily slide the seat back into place and snap the caps shut. Clean with warm soapy water made of high-impact polypropylene plastic UV additive maintains original color.