Made in Denmark since 1969, horticultural stonewool is widely recognized as an ideal growing substrate. Each Grodan A-OK Starter Plug has a pre-formed hole to insure easy seed or cutting placement. Gardeners simply wait for plant roots to penetrate the bottom of each A-OK Starter Plug before transplanting them into a larger stonewool cube or block. Grodan stonewool is known for its quality, consistency and performance. This is a single sheet of 98, one-and-a-half-inch plugs.