Big Tornado Roller Roll from the hairline to the crown with 192 spirally arranged protrusions. Double Ball Glide from the hairline to the crown, lifting upwards. High Thermal Conductivity The handle is aluminum. The rest is made of copper, down to the screws. It has very high thermal conductivity, allowing for gentle warming while stimulating. Wave Form Loosens efficiently with light pressure. ● Product Size (approx.): Width 3.3 x Depth 2.5 x Height 14.2cm ● Weight (approx.): 100g ● Materials Roller: Copper alloy Handle: Aluminum alloy (gunmetal plating) Heat conduction roller to promote scalp blood circulation. - Model Name: Heat Conduction Roller - Application: Scalp treatment - Features: Promotes blood circulation - Design: Non-invasive beauty needles Thank you for viewing.