White Gaps Nitrous Barrier, 50 pk These liners function as barrier devices that are inserted in nitrous-oxide hoods. They reduce the incidence of cross-contamination by shielding direct contact of hood to face during nitrous oxide and oxygen administration. They protect the nitrous hood interior from nasal secretions, as well as contamination and discoloration from oils, make-up, creams, etc. Features and Benefits: Made up from spun-bonded polyester Contains no dyes or perfumes Reduces the incidence of cross contamination