The Invacare® Top End® T-5 7000 Series Tennis wheelchair is faster, lighter, stronger and better than its predecessor! 7000 series aluminum material, enhanced head tube design and axle securing system improve performance and reduce overall weight by 1kg.7000 Aluminum reduces the overall weight of the chair by 1kg, making it comparable in weight with titanium frames. The advantage of 7000 aluminum is, the material is approximately 23% stronger than 6061 aluminum. Since the material is stronger, we are able to reduce the wall thickness of the aluminum tubes, reducing the overall weight. Best of all, the rigidity and strength of a 7000 aluminum frame is further enhanced by Invacare® Top End®’s sophisticated heat treating and powder coating process.