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Grodan Stonewool Macro Plugs with Slit (2000 Plugs)
Macroplugs are 1.5 in round with a slit that allows easy insertion of a cutting. These loose round plugs fit perfectly into the Gro-Block hole. For best results with these Macroplugs always insert them in a tray with individual cells. The individual cell will make sure the plug stays closed around the stem of your cutting.