Dimex EasyFlex No-Dig Tree Ring Kit, 12-Feet 4-Inch Absolutely no-digging necessary for installation, installs quickly and easily, easy to cut with hand snips Standard product suitable for landscape applications holding in lightweight bedding materials like mulch, or lava rock; 1.4 wall height Flexible and durable makes aggressive curves and straight sections with ease, no hollow round beaded top and no heating in the sun to make flexible Everything included to do a 4 ft. diameter tree ring (148 in.); Additional anchoring spikes sold separately; compatible model is 1989N-24C Kit includes (5) 8 in. Spikes and 1 Connector; Made in the USA from recycled materials