The mushroom shaped massage tool, often referred to as the knobble for its similarity to a door knob, is a very effective tool at deep tissue massage and trigger point relief. Its head is large and smooth and fits easily in the palm or held between fingers. The pressure is transferred to a rounded tip which provides instant relief at points of discomfort. Recommended for tired muscles, stiffness relief and relief from aches and pains. Effective for back of neck pressure relief for effective headache relief.