4pk humidifer filtr wick, Trapmax filter effectively traps water minerals and dissolved solids before they become airborne or build-up on inside of cabinet, The following models require 2 wicks each: HD12W, HD12WV, HD13W, HD14W, HD10W, and HD15W, 2 pack, Length: 6, 0"", Width: 10, 0"", Height: 11, 0"", SKU: ESCK419