Cut Faster & - The large and steady airflow of 30L/Min blows the smoke and debris generated by the laser engraver's work, helping the engraver to cut faster and , improving laser efficiency and saving your time. Clean Surface & Smooth Edge - The air assist device uses air to quickly reduce the temperature of the cutting material surface to prevent deformation and discoloration caused by high temperature, ensuring smooth lines, complete patterns and clean material surfaces. Laser Module Protection - The high velocity airflow blows smoke and particles downward and prevents them from flowing upward into the laser module, protecting the laser lens and thus extending the life of the laser module. Colour:Black & Silver Material:Plastic Package Contents: 1 * laser air assist pump 1 * trachea 1 * shunt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.