Respiratory Protection >> Koken | Spasciani Face Masks Code Detail 30 HNR Cleanroom 3-ply mask for electronic industries and clean room. NP12/NP12KR 4-ply mask with carbon filter for electronic industries (50 pcs/box). NP12 - inside each box contains 5 pcs/bag. NP12K - inside each box contains 1 pc/bag. SM 09 5-ply mask with carbon filter for electronic industries.