The 4200DX walker mobility aid is an indoor/outdoor use walker mainly for indoor use, yet its high quality six inch wheels will allow the occasional trip outdoors. This is the lightest 4 wheeled walker on the market with hand brakes. Made of durable and lightweight aluminum, the 4200DX walker folds conveniently and is very easy to handle in small areas. The 4200DX is equipped with a hand operated Push to Lock braking system for enhanced security. All Dana Douglas rollators have a patented Arthritic Ball at the end of the hand brake which makes locking the brakes extremely easy. Its unique design incorporates many of the features often found only on more expensive outdoor walkers at a very affordable price.