D&D4 Wiki
Attack bonus if proficient +3
Weapon die ([W]) 1d4
Type ranged
Range 6/12
Handedness one-handed
Proficiency category superior
Weapon group
Weapon property light thrown
Price 1 gp for 5
Weight ½ lb. per 5

A shuriken is a superior one-handed ranged weapon in the light blade weapon group.[PH:219]

A shuriken is a light thrown weapon, so a character can throw it as a ranged attack.

Monks and rogues are proficient with the shuriken.

Rogues with the Rogue Weapon Talent increase the damage die of the shuriken by one size (1d6). [PH:117]

Other classes do not have proficiency with the shuriken as a class trait, but any character can become proficient by taking a Weapon Proficiency feat.