This small lamp bulb is designed for educational and experimental purposes, featuring a compact and design. Its threaded screw base ensures secure installation, making it ideal for science projects, circuit experiments, and crafting activities. The bulb emits a steady light, enhancing visibility and precision during use. Features -Color:Multi -Material:Glass, aluminum alloy, tungsten wire -Size:2.20X1.00X1.00cm/0.86X0.39X0.39in - standard interface: designed with a universal base, this bulb ensures wide compatibility with various small sockets, making it ideal for diverse experimental setups -Low voltage design: operates at 5v, minimizing risks during experiments and ensuring secure handling for students and hobbyists alike -Stable illumination: for consistent brightness, providing reliable light sources for accurate results in electrical experiments -Compact and portable: small size allows easy transportation and installation, perfect for school labs, diy projects, and scientific activities - durability: built for extended use, reducing replacement frequency and ensuring uninterrupted experimentation and learning Package list: 20 x small light bulbs