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Grower's Edge Block Covers 6 in (40/Pack)
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, $25.49 (http://a2zgrowsupplies.com/growers-edge-block-covers-6-in-40-pack/))
Product Description
For blocks of rockwool and other grow media. Grower's Edge® Block Covers block light from mediawhich 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.