Made of 100% ball bearing construction Traditional frame design with special frame contour to fit hand and reduce hand fatigue Chrome housing and rubber hand pad Heavy-duty, single speed UL approved 120v This lightweight therapeutic massager combines the advantages of hand and mechanical massage. Its special contoured design reduces hand fatigue and its universal motor is constructed for heavy-duty use. Provides soothing, relaxing movement through your finger tips. Great for general body as well as scalp use.