Rage Powersports Roof Kayak Carrier Foam Blocks Great for securing a single kayak to a vehicle roof without crossbars or side rails Angled profile kayak hull-shaped foam blocks measuring 3.125" x 15.75" x 4" each (2) Pair cam buckle tie-down straps (2) Tie-down ropes for kayak bow and stern securing High-density polyethylene foam creates a buffer between the kayak and vehicle roof