O-ring for:Finnpipette Campus 50μLFinnpipette Colour 50μLFinnpipette Digital 50μLFinnpipette F1 50μL, 50μL microFinnpipette F1 ClipTip 50μLFinnpipette F2 50μL, 50μL microFinnpipette Focus 50μL, 50μL microFinnpipette Novus 50μL, 50μL microFisherbrand I 50μLFisherbrand II 50μLFisherbrand Elite 50μLNote: micro indicates uses micro tips