Visible Dust Improved Zeeion Refill Filter VisibleDust introduces the Improved Zeeion Supporting Back Filter. This more ergonomic design allows: * More efficient air-intake. * Acts as a vertical support stand for Zeeion blower. These unique filters eliminate potential damage that can be caused to your sensor from dust projectiles when using the blower - a common problem with ordinary blowers. The Zeeion® filters perform this task by removing quartz sand and other particles less than 20 microns across. After prolonged use the Zeeion® Blower will need the filters replaced to maintain it's optimum performance. No other blower filtration system provides the advanced protection for your sensors and camera equipment than the Zeeion® Blower. The Improved Zeeion® Filters Refill is designed only for the Zeeion® Sensor Blower. Package includes: * Front filter (1) * Supporting stand back filter (1)