Feature: 1. Air Assist: It is an all metal structure. Installation is very simple and you only need a few minutes to install. 2. High Speed Air Assist Nozzle: it is a high speed air assist nozzle with advanced fluid mechanics design. Only a 30L/min air pump can achieve a high speed airflow of 13.5m/s. 3. Faster and Cleaner: air assist will greatly improve the cutting ability of the S9. With air assist S9 cuts plywood and MDF boards 2-3 times faster, and cutting surfaces are cleaner and no smoky.(The air pump is not included in this package) 4. Excellent Air Sealing: The S9 nozzle has a sealing ring, and the air of the air pump will not leakage out. In addition, the sealing keeps out dust, which will increase the lifespan of the S9 lens. 5. Complete Accessories for Air Assist Upgrade: The package includes air assist nozzle, air pipe, sealing ring and other installation accessories you need. You don't need to buy additional accessories except air pump, directly to upgrade the S9 machine. Specification: Specification: Model: Air Assist Kit Air assisted copper tube outer diameter: 8mm Inner diameter of trachea: 7.5mm Air pump selection suggestion: Recommended choosing air pump of ≥30L/min, and the outer diameter of the air pump interface is around 8mm. Package Weight: 0.185kg/6.5OZ Package Size: 19x15x8cm/7.4x5.9x3.1in . Package List: 1 x S9 Nozzle Kit 1 x Acrylic Cover 1 x 1.5 meters air pipe 1 x Tool Kit 1 x Manual Note: Because of the powerful with air assist, it is forbidden to run the engraving machine unattended. Pause it if you're not around.For detailed machine instructions, please refer to the manual for parameter settings. When operating the engraving machine, please wear protective goggles. Do not touch the with your hands, otherwise you may burn your hands. Please avoid strong impact on the machine. It is forbidden for children under 14 years old to use this product, and children over 14 years old need adult attended.Do not use the directly to any specular reflection object, which may cause injury to the operator.