FlexiStack 4 Foot Rubber Border - Black The FlexiStack Border SystemTM is made from recycled rubber, is environmentally friendly, and offers a sturdy, safe and attractive look to any landscape or playground area. Designed with a patent pending inter-locking system, the borders create a "seamless look" allowing you to form the shape that best works for your landscape. The borders are also flexible rubber allowing graceful curves that will keep your mulch in place and even reduce the amount of mulch needed. They are also stackable to handle varying heights of uneven landscapes, gardens and playgrounds. Each border's overall dimensions: 48" long x 4" wide x 4.5" tall. The linear length is 42". Elegant design compliments any landscape or playground. Color: BLACK. (Available colors: Brown, Black, Green, Red.) A safe alternative to hard-edged materials that can hurt kids. Installation is quick and easy. Stakes securely into place.