... a solid surface YP-D55 28Khz Ultrasonic Hand-held Welder Handheld ultrasonic welding machines, also known as portable ultrasonic ... machine, ultrasonic spot welding, riveting machines, ultrasonic point welder, can be used for the butt welding of thermoplastics,welding ... stepper, treadmill accessories, box jumps, gymnastics mats, boxing gloves, boxing sandbag Sanda protective gear, the path to indicate ...