Acuforce 7 Lbs(blue) and 2.5 Lbs Massage Tool is specifically designed to use it's own weight in applying pressure during your therapy treatments. This saves your thumbs, wrists and elbows from fatigue and injury. The AcuForce 7.0 & 2.5 performs muscle stripping, cross- fiber friction and trigger point therapy. The tool is made with a special skin-like material that works incredibly well with lotions and oils. The 3 lb ice massager forms a large ice surface under the tool to perform long-lasting therapy, weight of the tool removes the need to apply pressure during treatment.