Whether you choose a K0004 or K0005 folding Catalyst, you can count on quality construction, durable design and light weight. All models are made of 7000 series aluminum, a stronger and lighter, vibration-dampening alloy. An enhanced cross brace design and swing-away front footrest hangers create a wheelchair with greater custom configurability and durability. In seat widths of 14-22", seat depths of 14-20" and a 350-lb. weight capacity.