510 stainless steel + resin with filter anti-smoke oil return drip tip. Stainless steel + resin material, sturdy and insulated against hot mouth. 510 interface, large caliber supports large smoke. The interior is equipped with a stainless steel mesh to prevent the mouthpiece from flowing back, filtering the smoke and thus having a better taste. As shown, there is a main color, but it is not exactly the same as the picture.