It’s simple – it’s all in the paper. Our wicks contain more paper than the competition. The quality of our paper has greater absorbency, lasts longer, and requires less energy to provide the same amount of humidification as the competition. The HDC411 wick is made right here in the USA under our high quality control standards. Trapmax® filtration technology Out performs the competition Package contains 4 wicks Use only original AIRCARE wicks for optimal performance of your humidifier Use of water softener voids warranty Compatible with AIRCARE HD3120DCN and Idylis IHUM-10-140 Compatible with MoistAIR HD1205, HD1211, HD2412 Type: Replacement Antimicrobial: Yes Package Quantity: 4 Brand/Model Compatibility: Compatible with Idylis IHUM-10-140 CA Residents: Prop 65 Warning(s): Yes Warranty: 30-day limited UNSPSC: 40101900