This Grodan Big Mama case comes with 18 Blocks. Grodan Delta constitutes the basis for the uniform and perfectly controllable propagation of plants, the condition to be met for powerful and healthy plant growth. Each block has a virtually identical density, flexibility and sturdiness, guaranteeing a uniform distribution of the WC, EC and pH which in turn results in a uniform and high-quality plant. Interested in buying in bulk? For pallet quantities or more please call 855-289-1441 or email progrowershouse.com for the most competitive price.