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Grower's Edge Block Covers, 40-Pack
For blocks of rockwool and other grow media. Grower's Edge® Block Covers block light from media—which helps reduce algae. Use white side up to reflect light. Use toothpick to hold cover in place. Hole in center of cover measures 1/2 inch in diameter.
Specifications
| Area (standard) | 4 in x 4 in, 6 in x 6 in |