The 36-inch coir tree rings are made from 0.2 inches of thickly woven, sustainable and natural coconut fibers. Coco tree rings are used as mulch mats, used to control weed growth, or as a plant protector cover. The coco coir fibers allow air, water, and nutrients to permeate through. Coconut mulch rings are lightweight and easy to slip around a tree trunk or small plants. For a larger center, trim the weed control disc center with a scissor. Each pack includes 12 coco coir plant covers.