Using Sebnux boat keel guard can minimum future possible damage from sand, rocks, concrete ramps, oyster beds, underwater objects and reduce scrapes, daily wear and tear on the water. High-strength marine rubber provides the product with better anti-collision and corrosion resistance. Sebnux 5-inch wide boat keel protection easily conforms to your boat's keel; it s shock absorbing, exclusive contoured edge design, and drag reduction channels won't slow your boat down Sebnux boat keel protector features special self-sealing contoured edge, that, save messy sealants. Only needs 4 easy simple steps; etch, clean, prime, apply! Sebnux provides 5 sizes range from 4 to 8 feet long to ensure you have the correct size.