Place the revolutionary FloraCaps on your 4 Rockwool cubes and maximize your space in the vegetative cycle. 17 flower-designed louvers block light while allowing air, water, and nutrients to your plants. The FloraCap was designed with the vegetative state in mind but has proven a worthy tool for the avid top feeder throughout the flowering stage as well. Eliminates algae and the use of pesticides by covering the media. 17 flower-designed louvers. Four three-way stakes on the bottom for extra stability. Holes in all four corners for leftover water drainage. Stackable. Reusable. BPA and lead-free plastic.