Grodan RW108004 macro plugs are suitable for germinating vegetables and ornamental crops from homogeneous seedlings or cuttings. Each plug is practically identical in density, strength, and fiber structure. The distribution of water, nutrients and pH is equal, resulting in positive germination results. These macro plugs have a slit opening that allows for easy insertion of a cutting or bare-root plant. These 1.5-inch round plugs fit perfectly into Grodan gro-blocks. For best results, always insert them in the Grodan gro-smart tray. The individual cells will make sure that the plugs stay closed around the stem of your cutting. Contains 50 plugs per pack.