Patented reinforced design for longer life and better efficiency than standard expanded wicking filters. Traps impurities in the water. Anti-microbial treated. Fits Sunbeam SCM3501, 3502, 3609, 3656, 3657. Fits Holmes HM850, 3400, 3500, 3501, 3600, 3640, 3641, 3650, 3655, 3656. Fits Honeywell HCM6009, 6011i, 6011ww, 6012i, 6013i. Fits Bionaire W12, W14, W15. Fits Touch Point S120E-A, S120E-C. Fits White-Westinghouse WWHM-3300, 3500, 3600.