Working with impact and power tools takes a toll on your hands, as vibrations from tools can cause hand fatigue and over time, injury. The TrembleX features Cestus-specific vibration absorption technology that fully absorbs vibrations before they hit the hand to prevent fatigue or injury. TrembleX also provides a silicone coated palm which allows added gripping power. Size: large. Color: Black. Gender: unisex. Age Group: adult.