Strong and durable - injection molded of high-impact, chemically resistant 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 simple to install - only requires a screwdriver, release ' clean adjustable hinges for a perfect fit, corrosion proof, self-aligning hardware clean with warm soapy water made of high impact plastic UV additive maintains original color.