Description BMC masks are compatible with the machines and pipes from other brands. The BMC nasal pillow mask P2 (S, M, L Combo Pack) has an ergonomic design and is perfectly compatible with CPAP and Auto CPAP machines. Three sizes-small, medium, and large are included in the package. Required for new CPAP and Auto CPAP users. Super silent: Nice control is more effective due new decentralized venting holes. Super light: The smaller size and redesigned headgear help to control the total wight significantly to hardly feel the mask during use. Super simplicity: Simple structure with flexible headgear makes mask fitting, assemble, disassemble and cleaning easy. Super comfort: Outstanding ergonomic design better fits the nostrils. Three cushion size (S/M/L) in one package enables you to choose freely. https://www.youtube.com/watch?v=YUNJeqvz68A