Shake Weight dumbbell with vibration function. A New Japan Pro-Wrestling wrestler was in the commercial. Hosono, the 70kg arm wrestling world champion, also seems to be a user of this product. - Model Name: Shake Weight - Color: Clear/Black/Yellow - Material: Plastic/Metal - Features: With vibration function I am selling this because I don't use it for New Japan Pro-Wrestling. This is a used item, so please refrain from purchasing if you are sensitive to such things.