The Wartenberg wheels by Mr. Steel are precision tools designed for sensory exploration and stimulation. Made from high-quality stainless steel, these wheels feature sharp but safe needles that glide smoothly on the skin, creating a pleasant tingling sensation. They are used in medical settings for nerve stimulation or sensory play, offering controlled intensity with each roll. Ergonomically designed for a comfortable grip, these wheels are ideal for those seeking an exciting addition to their sensory play collection. Recommended caution: always clean before and after use.