Rightline Gear Foam Block Stand Up Paddle Board Carrier - The Rightline Gear Foam Block Stand Up Paddle Board Carrier attaches to vehicles WITH or WITHOUT a roof rack, using innovative Car Clips that attach the straps to a vehicle’s door frame weather molding. This means no straps run through the inside of the vehicle! The SUP Carrier’s Dual Lock Straps secure the Foam Blocks to rack or roof so they don’t shift during transport. The same straps run back over the top to secure the SUP to the Foam Blocks for increased stability. Spacer Blocks are included, allowing stacking of (2) SUPs. Features Capacity: Up to (2) SUPs Dimensions: 7.4” L x 3.9” W x 3.6” H each block Designed for all vehicles, WITH or WITHOUT a roof rack Foam Blocks strap to rack or roof so they don’t shift during transport With a roof rack: Foam Blocks fit aero, square, and round cross bars Includes: (4) foam blocks, (2) foam spacers, (2) dual lock straps, (4) car clips, (1) SUP end strap, mesh carry bag, and set up guide.