These Holmes humidifier wick replacement filters fit Holmes models HF212 HM1281, HM1701, HM1761, HM1297, HM2409, HLS1400, HLS1300, HM1230, HM1245, HM1275, HM1280, HM1285, HM1290, HM1295, HM1296, HM1450, HM1600, HM1760, HM1700, HM1740, HM1910, HM2005, HM2025, HM2030, HM2408, HM1281, HM1701, HM1761, HM1297, HM2409, HLS140, HLS1400, HLS1300, WWHM1230, WWHM1285, and WWHM1290. They measure approximately 4 H x 4 1/2 ID x 6 1/2 OD x 1 Thick. Features an antimicrobial agent! Honeycomb filtration to trap mineral pollutants found in water and help prevent them from entering your home. For optimum performance, replace filter at the beginning of each season or every 2 months depending on use.