Notes On Purchasing: The Default Size Is 12Mm*37Mm. The G4 Led Bulbs Are Slightly Larger Than The Normal G4 Halogen Bulbs. Please Check The Dimensions Of This Product Carefully To Ensure They Fit Your Device Before Purchasing. . Save Energy: Apply To Ac 12V Ac And Dc Appliances. 2W Equivalent 15W G4 Halogen Bulbs Energy Saving Led Bulbs That Can Save Up To 90% Energy Savings On Running Costs. High Quality Materails: Warmwei G4 Led Lamps, 3000K / 130 Lm, 360 Beam Angle, Silicone Material Coated, Pressure Resistant, Heat And Impact Resistant. . Ultra Long Lifespan: G4 Led Bulbs Last Longer Than Traditional Halogen Capsules. Environmentally Friendly And Extremely Efficient: Uses Only A Tenth Of The Energy Of 15W Halogen Lamps. . Wide Range Of Applications: Ideal For Chandeliers, G4 Lamp Fixtures, G4 Wall Lights And Most G4 12V Ac And Dc Light Fixtures For Landscape Lighting, Courtyard, Garden, Lawn Lights, Puck Lights, Closet Lighting Etc.