12 Refills: Easy to use, Peel off the protective film coating from the sticky side of replacement disc and place inside your Pest Trapper dome. Safe, Odorless, and Effective indoor solution: The strong adhesive keeps fleas, fly, and more trapped for good! Refill is a universal fit – Disc Traps fits all Flea dome models. 12 Refills: Easy to use, Peel off the protective film coating from the sticky side of replacement disc and place inside your Trapper dome.