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These OEM replaceable fiberglass pads are manufactured from recycled crushed glass known as “cullet." The continuous glass fiber media becomes polarized by the charge from the power supply and acts like a powerful magnet to attract sub-micron particles. Each year supply order of replacement pad consists of 8 pieces of fiberglass, cut specifically to your filters size. Each change requires 2 pieces of fiberglass and is recommended to be changed every 3 months. The initial purchase of the Wingman1™ will come with a 3-month supply of replacement pads.