Six Pack Trainer Arm Trainer Optional Color:Six Pack Trainer It moves its head up

It moves its head up and down automatically

Comes in two Sizes: 18x6 and 18x9 Inches

What you need to do is just to assemble the casters with wrench (included)

bigger one :16

3 inches / 33

Six Pack Trainer Arm Trainer Optional Color:Six Pack Trainer It moves its head upIt's for body muscle training. This Ultimate ABS Stimulator can help to tone, tighten and strengthen your body muscles, you can gain a better figure after consecutive use of this product for about 2 months. Is it safe? The micro current using EMS technology directly affects the muscle fiber and strengthens and shapes it the best way without causing any damage to the body.