Take a look at these features, and you'll understand why: Aluminum construction is sturdy yet lightweight and comes in attractive finishes that resist marring and scratching. Dual push-button adjustment mechanism (height adjusts from 30" to 39") with locking ring allows for quick, secure fitting and for quad cane bases to be ambidextrous. The non-skid rubber tips with metal inserts ensure a secure grip and long lasting performance. Plus, no assembly is required. 250-lb. weight capacity.Limited lifetime warranty on frame and base. Six month warranty on handles, tip, push buttons, and "wearable" parts. Large Offset Handle Quad Canes with 8" x 12" FootprintBlack. (Case of 2).