Block Covers - 4" (40/Pack)

Price was a competitive one, shipping was very fast and these covers work like they are supposed to!

They did not curl up on me, they laid flat. Could be a little thicker material for sure, but they did lay flat.

the side roll up defeats the purpose

Worthless do not buy these. The sides are all curled and do not cover the net cups properly at all. Total waste of money, these went directly in the trash.

These curl up when the white side is up.

simple easy to use keeps the algae at bay

Don't waste your time. Make your own. For instance, upcycle discarded plastic containers such as laundry detergent bottles. These things are as flimsy as flimsy gets. The edges curl up.

do not buy this product, does not stay on the grow block and needs to pined down with tooth picks