Stack your SUPs securely with this SUP Stacker Block from Riverside a division of Seattle Sports, It prevents scratches and dings while stacking stand up paddleboards on the roof of your car. This stacker blocks features extra wide, low-profile, and comes in packaged pairs. The dimension of this stacker block is 1.25in H x 4.75in D x 23.25in W, and it includes 2 blocks. It has anti-slip bottom to stay in place. This stacker block is easy-to-use. Specifications Normally Ships in 0 to 2 Business Days Block Dimensions 1.25in H x 4.75in D x 23.25in W Features Benefits Anti-slip bottoms Keeps board or boat in place while protecting the vehicles Low-Profile Allows you to stack your SUPs easily and securely Utmost protection Eliminates from scratches and dings Uses Ideal to stack stand up paddleboards on the roof of your car Additional benefits Sold in packaged pairs Guaranteed Workmanship and Performance