construction: made with stainless steel, ABS, and silicone for durability and reliable performance. Precise handling: squeezable handle provides controlled liquid output, helping prevent hand stains and reducing waste. Easy to use: fill the liquid tank, squeeze the handle, and comb through your hair for a refreshing scalp treatment. Innovative design: features 5 elastic rolling ball teeth for even liquid distribution to the scalp and hair, enhancing the effectiveness of your treatments. Practical and versatile: compatible with scalp serums, oils, and other topical liquids; simple to clean and maintain. Use scenarios Scalp treatment session: fill with a scalp serum or lightweight oil, squeeze to apply, and use the comb to distribute evenly across the scalp while massaging for better absorption. Postwash care: after washing, apply a scalp treatment to damp hair; use the device to spread the product evenly from roots to midlengths. Quick scalp refresh: deliver a light treatment liquid to the scalp and gently comb through to refresh and rebalance scalp moisture.