These are Filters for the Airbrush Cleaning Station from Testors. FEATURES: Replacement filters for Testors Airbrush Cleaning Station (TESR5303) Replace the filter when it becomes totally discolored Carded packaging INCLUDES: Three Airbrush Cleaning Station Filters REQUIRES: Testors Airbrush Cleaning Station (TESR5303) SPECS: Diameter: 3-3/8" (8.6cm) sdw 10/25/01 ir/kh