6" Square Grow Lids Dual Sided Black / White Grodan Rockwool Block Covers, 40 Pack + Stakes
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<b>[Product Information]</b><br>
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<li>Dual-sided 5.5mil grow lids have a white face to reflect light back to the plants and a black side to block light</li>
<li>Helps with algae, mildew and pest control</li>
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