Grodan stonewool is known for its quality, consistency and performance. Each sheet of Grodan Stonewool A-OK Starter Plugs is perfectly sized to fit a standard flat and each plug has a preformed hole to easily plant seeds and cuttings. Once plants have rooted, gardeners can transfer individual A-OK Starter Plugs to larger pieces of stonewool or plant them directly in soil. For any growing application, stonewool offers speed, ease of use and cleanliness. A-Ok plugs come labeled with instructions in a shrink-wrapped package that fits a standard 10 x 20 tray (flat). This is a single sheet of 50 2" square plugs.