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Rockwool Block Covers, 40 Pack Available in 4" and 6" sizes of Rockwool/Stonewool Block Covers. Dual Purpose Rockwool Block Covers reflect light back towards plants in addition to protecting them from algae growth. Black on one side, white on the other, these block covers will work with any media, although they are designed for four-inch stonewool cubes. There are 40 individual covers in each pack.
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🇺🇸 Ship from USA · On Agora since 2026
$9.25