MPS Master Paint System, 4 Pack Set of Mini Size 6 Ounce (180ml) Hard Cups and Retainer Rings. Set includes 4 hard outer cups and 4 retainer ring collars for use with the MPS disposable paint spray gun cup liners and lid system. You receive 4 times as many hard cups and retainer rings, then other advertised hard cup sets. The MPS 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 MPS disposable cup system with almost any brand of spray guns. Master Elite Series PRO-22 Touch Up Spray Gun Models require the MAS MPS-882 spray gun adapter. Master Elite Series PRO-33, PRO-44 & PRO-88 HVLP Spray Gun Models require the MAS MPS-881 spray gun adapter. 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 by using the MPS disposable cup system! 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. All components of the professional MPS disposable cup systems are available both individually and in sets and kits. Eight versions of MPS spray gun cup adapters are available separately, allowing you to use the MPS cup system with most major brands of spray guns and types from full size to mini detail guns.