The staple for any Airsofter, Paintballer and MilSim player's pyrotechnic arsenal. The TLSFx MK5 Thunderflash does exactly what you expect, delivering a loud report and distracting flash of light, reliably and consistently.
 
The simple and effective "twist and strike cap" friction ignition system activates the consistent 7 second fuse. When the 7 seconds is up, the Thunderflash detonates with a loud bang and a bright flash. The twist and strike cap also protects the tip from damage and accidental ignition.
 
There is a reason why this is so popular.