Grodan 25x25x40 mm planting cubes with hole and planter 150 pieces, BOX 18 pieces. Rockwool Grodan is an inert medium for optimal plant growth. Made from basalt wool with excellent absorption, it promotes root development. Hole size: 6x15 mm, size of the planter with cubes: 53x32x4.5 cm. Hole: 3x10 mm, size of the planter: 53x32x4.5 cm.