Similar size as the AO36 but with the MM40 each cube comes individually wrapped in paper and has a wider base. These cubes are more suited for cuttings.Stonewool is recognized the world over as the ideal hydroponics growing substrate. Grodan stonewool is known for its quality, consistency and performance. These Mini-Blocks are excellent for starting seeds and cuttings and are easily transferred to larger stonewool once roots have been established. Pictured is broken up slab of 45, one-and-a-half-inch individually wrapped cubes.Cube Size: 1.5" x 1.5" x 1.5" wrapped The case includes 50 slabs or 2250 cubes.