Grodan® A-Ok Starter Plugs™ are designed for seed and cutting propagation prior to blocking on into larger growing blocks. The V-shape design of the plug discourages tangling of roots between the plugs in the AOK plug sheet. Come in a sheet that fits a standard 10x20 flat.Grodan® Stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes， blocks， or slabs. Where other rockwool brand manufacturers cut all sizes from one batch of wool， Grodan® is unique by making different types of fibers. The purpose is to support the requirement of the plant in the different plant stages. Grodan® has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. Grodan® comes in graduated sizes. Seedlings started in cubes are easily transferred to blocks and then onto slabs， if desired. Seedlings or cuttings started in the Grodan® cubes can also be transplanted into more traditional planters and growing mediums.98 CountSize: 1.5 x 1.5Made from molten rock spun into cotton candy like fibers and then compressed into cubes， blocks， or slabsUnique by making different types of fibersSupports the requirement of the plant in the different plant stagesAbsorbs nutrient solution while retaining plenty of oxygen for rapid plant growthSeedlings started in cubes are easily transferred to blocks and then onto slabs， if desiredCan be transplanted into more traditional planters and growing mediums.