Grodan A-Ok 1.5" Rockwool Starter Plugs (12 Pack) plus Clonex 15mL Rooting Compound Twelve (12) Grodan A-Ok 1.5" Rockwool Starter Plugs, and One (1) 15mL Satchel of Clonex Rooting Compound. Grodan A-Ok Rockwool Starter Plugs provide the optimal media for rooting for seedlings or cuttings. A-Ok starter plugs are used prior to plugging into the larger Grodan Gro-Blocks. Clonex Rooting Compound is a thick gel which will remain in contact around the stem, sealing the cut tissue and supplying hormones needed to promote root cell development and vitamins to promote new root tissue. Clonex Rooting Compound has a full spectrum of primary nutrients and trace elements to nourish the young roots plus anti-microbial agents to protect against fungal contamination.