The robust EZBorder RockEdge garden border is made of durable, all-weather resistant recycled rubber. The unique interlocking system of this modular garden edge allows it to curve around garden beds. Segments interconnect, with 7-10mm of articulation to accommodate the garden's curvature. Each kit includes 6 straight 4-inch tall pieces. Each piece measures 8 inches in length, but covers 7 inches linearly, as one inch is recessed for articulation. RockEdge Corner and RockEdge End pieces are sold separately. Choose from Inside Corner, Outside Corner and Straight End pieces to customize your project and give the edge a finished look. The molded texture looks like natural stone, and creates a definite border between the lawn and garden spaces. Use to separate aggregates such as soil, mulch, lawn, gravel or decorative stone such as river rock.