Case of 48. Grodan Delta Hugo is an alternative to the traditional potting container. Gro-Blocks are similar to a ‘plant container’. Holes are perfect size for any 1.5” starter plug. Come in packs labeled with instructions. Grodan also manufactures these blocks to have a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth. They are also ideal for high volume greenhouses where grow space is an issue. Various sizes available. 6in Block with hole. Dimensions: 6in x 6in x 6in.