Using high quality drum pipe and high quality steel welded, firm and durable. Movement joint: use high quality bearing, make the movement process more smooth and round. Handle: reasonable design, comfortable grip, easy to power, more smooth movement. Guard plate: ABS material reinforced by one-time molding technology, durable. Main frame: high quality flat ellipse pipe, welded firmly, never out of shape.Seat cushion: PU foaming technology, ergonomic, moderate hardness, soft and comfortable.