Non-skid laminate, cut out fits bar racks. Universal Kayak Kit 18″: Blocks 3.75in H x 4.75in D x 17.75in W. Includes: 2 Universal Kayak Non-Skid Blocks 2 18ΓÇÖ Bow & Stern Cam Buckle Straps 2 9ΓÇÖ Block Straps 1 15ΓÇÖ Center Strap with Cam Buckle 4 Galvanized Steel S-Hooks. Deluxe Kayak Kit 14: Blocks 3in H x 3.75in D x 13.75in W. Includes: 2 Deluxe Kayak Non-Skid Blocks 2 18ΓÇÖ Bow & Stern Cam Buckle Straps 2 9ΓÇÖ Block Straps 1 15ΓÇÖ Center Strap with Cam Buckle 4 Galvanized Steel S-Hooks. Standard Kayak Kit 12″: Blocks 2.75in H x 3.75in D x 12in W. Includes: 2 Standard Kayak Foam Blocks 2 15ΓÇÖ Tie Down Ropes 2 9ΓÇÖ Block Straps 1 15ΓÇÖ Center Strap with Cam Buckle 4 Galvanized Steel S-Hooks