RTS Home Accents Rock Lock Interlocking Border System Curved Section With Spikes, 30-Inch Long, 4-Pack Look and feel of real stone; Each section only weighs 9 pounds Easy to assemble; Endless layout possibilities Suitable all year round and will not crack or chip in any weather Includes 4 curved pieces with 18-Inch spikes Extends your growing season as the hollow walls insulate the soil and plants