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. Have a great time shopping!