uxcell 20Pcs DC12V Car Interior Dome Map Festoon Adapter Light Bulb Base 30-40mm Spring Product Name: Spring Dome Festoon Bulb Base; Material: Plastic,Metal Dimensions: 6.5 x 4cm/2.6 x 1.6 inches(L*W); Color: Black,Red,Silver Tone Net Weight: 43g; Package Content: 20 x Spring Dome Festoon Bulb Base Voltage: DC 12V Fit Bulb Size: 3cm/1.2 inches-4cm/1.6 inches