M38 Single Vent Smoke – Friction Device
To use it is easy as can be. Twist off the cap and use the end to strike the exposed fuse, like a safety match. Then the grenade will start to produce a thick cloud of smoke for 50-60 second estimated burn time.
There is ten colours to chose from : white, yellow, pink, green, violet, orange, dirty, red, blue, turquoise with more colours to follow.