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Grodan Improved GR40 Uniblock, 8" x 8" x 4" no hole
Grodan® A-OK Starter Plugs™ - 1.5in x 1.5in x 1.5in - Shrink Wrapped
Grodan® A-OK Starter Plugs™ 1.5in x 1.5in x 1.5in - Unwrapped