Fundamental Beam is a beginner’s dream, extremely stable, perfectly portable and forgivingly fun. Fundamental Beam is 6' long and 8" high with an 18" wide base tapering upwards to a 6" top working surface. Filled with solid layers of crosslink that will not break down and feel mushy like competitors versions filled with softer polyfoam. These beams are covered with the same excellent and extremely durable 18 oz. vinyl we use to make all of our mats. 2" wide loop fastener strips on each end makes it easy to join several together to meet your individual needs. (4" wide hook fastener flaps are optional and can be purchased separately).