Material: Carbon steel Size:2kg,4kg,6kg,8kg,10kg,15kg,20kg,30kg Surface:PVC vinyl coated This anchor is designed to penetrate sand, mud, gravel and grassy bottoms quickly while maintaining a firm hold. Arc welded oversized flukes pivot downward into bottom to set fast, stow flat and provide years of reliable service. Excellent weight-to-holding power ratio, compared to cast anchors.PVC coating to help protect boat gel coat. Individually labeled.