Accessories: Set comes with 8 sandbags, 8 D-buckles, 8 clips Durable material- - Boat cover mooring sandbag is made of 840D oxford material which has excellent tear resistance BUCKLE DESIGN - - The top buckle allows our sandbags to be secured wherever you want them to be. BONUS ACCESSORIES - - Matching clips and D-shaped hiking buckles allow the sandbags to hang from the boat cover, and 8 sandbags are enough to keep the boat cover or other covers in place to prevent them from blowing away in high winds! Simple installation: simply fill the sand bag with sand, attach the bag to the D-buckle, and then attach the D-buckle to the clamp, which can be clamped around the boat or car cover or machine cover to secure and tighten the rotating button located on the clamp.