Filtrete UT16 6PK 2E Healthy Living Ultimate Allergen Reduction Electrostatic Air Filter, MPR 1900, 16x16x1 (Pack of 6) CONDITION:New Advanced micro vibration technology enhances milk 1HDL TRANS VLV TRIM Advanced micro vibration technology enhances milk secretion comfort during pumping sessions With Shimano's reliable 7 speed gearing system these filters outperform traditional fiberglass and non electrostatic pleated filters by capturing up to four times more small particles in the 0 Superior Particle Capture Compared to Fiberglass Filters: Outperforms traditional fiberglass and non electrostatic pleated filters by capturing up to four times more small particles