This is a SAT32748 Air Cap Set KLC. Highest economic efficiency SATA's HVLP technology guarentees transfer efficiency rates. Significantly above the 65% by VOC legislation. This spray gun is not only environmental friendly but it also saves alot of material. The durable air caps are made of brass, not aluminum, thus ensuring a long life time, Suitable for waterborne paints. A slightly higher air volume enables fine atomization & provides less need for sanding.