Usage Tips:Part number: 41-1660; Performance: krypton flashlight bulb can produce 4.8 volts at 0.75 amps, emitting bright light to meet daily lighting needs Compatibility: the replacement bulb works well for 3D lights (or 4D lights), the quality glass and metal material allow them work for a long time Easy installation: the flashlight bulbs are easy to install and remove, you can conveniently replace the old or broken bulbs on your flashlight without taking much time Size: krypton replacement bulb is about 0.3 cm/ 0.12 inches in length, small and easy to store, won't take too much space in your home, but please keep them away from little kids to avoid swallowing risk What you get: you will get 3 pieces of flashlight bulb replacements, enough quantity for your daily use and change; Warm note: please ensures the size before purchasing 3 Pieces 6-volt/ 4D-4.8-volt 0.75a bayonet base krypton replacement bulb flashlight bulbs Specifications: Material: glass, metal Part number: 41-1660 Length: approx. 0.3 cm/ 0.12 inches Easy to install: Check the size and part number first Open your flashlights and take out the old broken bulbs Install our bayonet base replacement bulb in Finally assemble your flashlights Package includes: 3 x 3D(4D)-4.8-Volt 0.75A bayonet base flashlight bulb Note: Please allow slight size errors due to manual measurement. Please keep the flashlight bulbs away from little kids to avoid swallowing risk.