You can fill this sandbag set with sand and hang it on an Aerocover cover by means of clamps. This makes the cover heavier so that it hangs tight and the water drains better. In addition, the cover does not blow up as quickly. The set consists of 4 sandbags. Specifications Brand: Aerocover Model: Cover sandbags 4x. Model number: 7812. EAN: 8717591776833Material: polyester. Color: anthracite. Dimensions: 14x16cm 4pcs.