These round hatch covers are made of injection-molded polycarbonate and high-grade rubber for strength and durability. Special UV protection shields against sun damage, and all hatches are sealed with TPU, which provides superior resistance to impact, abrasions and tears regardless of the conditions and weather. Dome-shaped hatches allow water to siphon off while providing extra room below. Snap-on, snap-off design fits snugly, yet provides easy access. SEA-LECT Designs makes it easy for kayak builders to customize their hatches with logos and custom colors.