Mini-Blocks 2" x 2" x 1.5" sit in a tray (flat) without support for easy starting of seeds and cuttings. Once rooted, the blocks are transferred to a larger piece of stonewool. Mini-Blocks can be planted directly into containers for soil gardening as well. Two strips of 12 wrapped Mini-Blocks give you 24 total blocks. Grodan stonewool is known for its quality, consistency and performance.