Snowballs

Overview
Snowballs are a type of throwable exclusive to snow-themed maps, being Cold Fusion, Arctic Dusk, and Sleet. They come in a pack of five, and are thrown much faster than anything else, such as a shuriken or grenade. Unlike hand grenades or shurikens, this item disappears on contact with a wall or surface and does not remain on the ground.

Trivia

 * Snowballs deal lots of damage when aimed correctly (eg. at the head), so in some cases they can be better than the shuriken (at least in terms of capacity).
 * The only possible way to suicide with the snowball pack is to shoot the snowball up into the air and then let it fall down onto you. However, the snowball has a low chance of hitting you, making it almost impossible to suicide.
 * Despite being a pack of five snowballs, it appears as a pack of 3.