Adds +1 to Dexterity (thus, depending on prior Dexterity score, either 0/+1 To Hit with ranged attacks, either 0/+1 to AC, and either 0/+1 to Reflex saving throws)
Sling
Adds +2 to Dexterity (thus adding +1 To Hit with ranged attacks, +1 to AC, and +1 to Reflex saving throws) and +1 to Constitution (thus, depending on prior Constitution score, either 0/+1 to Fortitude saving throws and either 0/+1 to max HP per character level)
When the wearer attacks with a sling, gain +2 To Hit. It does not affect any form of attack other than slings. It affects Sling Staff attacks, but only when used to make a missile attack.