Features: Sufficient quantity: The package includes 20 pieces of E10 mini bulbs, sufficient quantity is enough to meet your daily use and replacement; Safe and reliable quality allow you to use for a long time (within the rated voltage range), please rest assured to buy. Multiple uses: Compatible with a variety of electric tools and applied in experiments, quality materials, bright and warm light, durable and safe characteristics make it an essential electrical appliance for elementary school science, middle school physics laboratory, and student home laboratory. Specifications: Material: glass, metal Bulb size: approx. 2.3 x 1 cm/ 0.9 x 0.4 inches Color: as the picture shown Package includes: 20 x E10 screw mini bulbs Warm notes: Please allow slight deviation due to manual measurement. Please allow slight color difference due to different monitor. Fragile items, please be careful when using. Please keep the E10 bulbs away from little kids to avoid swallowing risk.