4 Pack Set of Mini Size 6 Ounce (200ml) Hard Cups and Retainer Rings. Set includes 4 hard outer cups and 4 retainer ring collars. The Disposable spray gun cup system's outer hard cup connectors are compatible to work with, and twist-lock onto original styles of spray gun adapters, not 2.0 style. The proper adapter will allow you to use the Disposable cup system with almost any brand of spray guns. Master Spray Guns, MPS disposable cup system works excellent with all types of paints, primers, epoxies, and commercial coatings. Use the cup system with automotive paint basecoats, clearcoats, topcoats and primers, as well as with stains, sealers, gel coats, varnishes, urethanes, enamels, and lacquers. Dramatically increase your spraying efficiency and overall productivity by saving time, labor, waste, and money Reduce your paint material waste and cleaning solvent waste, while at the same time eliminating the cost and labor associated with cleaning traditional metal gun cups and the need for mixing cups and paint cans.