The 24-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. Easy To Use: Simply slip these coco coir plant rings around trees or smaller plants to provide total protection from unwanted weeds or frost; you can use scissors to customize and enlarge the center of each planter disc. 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. Trim the weed control disc center with a scissor for a larger center. Each pack includes 20 coco coir plant covers.