The Grex TF-3, TF-5 & TF-7 fan spray caps provide excellent fine atomization like an automotive spray gun but on a micro scale - basically transforming your airbrush to a mini touch-up gun. These are compatible with our Tritium (TG & TS) and New Genesis (XGi & XSi) airbrushes. Use these for quicker and larger area coverage. Where other airbrush manufacturers produce one fan spray airbrush, Grex has created three different interchangeable sizes to accommodate the end users specific needs.The TFK-3, TFK-5 & TFK-7 are convenient kits that include a fan spray cap with the matching needle, nozzle and nozzle caps. For proper performance of the fan spray cap, its necessary for the internal fluid nozzle and needle to be of the same size as that of the fan cap itself. For the end user who utilizes their Grex airbrush on a variety of scales and sizes, were providing the necessary internal parts to easily accommodate when a change in fan cap size is appropriate.