Rubber Designs Rubber Tree Rings are the perfect compliment to any landscaping project. Our recycled rubber tree rings allow water and nutrients to pass through and help prevent weed growth, fungal growth and erosion. Made from 100% recycled waste stream tire buffings, Rubber Designs puts the green in your garden. They are pre-cut to the center to make handling and installation easy. With the ability to mow right over the tree rings, less time and money will be wasted maintaining your yard every year. Tree rings are available in 30", 48", or 60" sizes and come in a variety of attractive colors and materials.