Sized at 11 3/4" x 11 3/4" x 4", EcoGrid® provides 39% open space for drainage aggregate or soil for grass turf. EcoGrid® has the largest percentage of open space in the industry, allowing the most opportunity for water to permeate into the sub-soil. EcoGrid® provides the maximum percolation that a normal drainage field system will accept. Hanover´s EcoGrid® interlock for stability to support moderate vehicular traffic. Stocked in Hanover´s Natural color, EcoGrid® can also be made to order in custom colors when quantities permit.