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• 2F Dual Sealing, Protection Cover Placed On The Inner Ring Protects Against Rough Impurity Particles And Makes The Labyrinth With The Sheet Part Of The Seal; Then The Sealing 2S Type, With The Labyrinth Between The Sheet Part And The Rubber Lip That Conducts The Contact Sealing. The Friction And Speeds Are The Same As With 2S But Has Much Better Protection Against Rough Impurity Particles. It Is Very Good Sealing System: The Sheet Part Protects The Seal From The Soil, Dust And Rough Particles. At The Same Time Makes The Labyrinth With The Rubber Part. The Rubber Part Provides The Contact Sealing That Prevents The Penetration Of The Finer Impurities, Water, Moisture, Steam Etc. Suitable For Heavier Conditions Due To Better Protection Against Foreign Matters. It Is Used With The Y Bearings (Standard)