The material below is Open Game Content from a 3PP Source
Belt of Giant Strength
Aura moderate transmutation; CL 8th
Slot belt; Weight 1 lb.; Price 4,000 gp (+2), 16,000 gp (+4), 36,000 gp (+6)
This belt is a thick leather affair, often decorated with huge metal buckles. The belt grants the wearer an enhancement bonus to Strength of +2, +4, or +6. Treat this as a temporary ability bonus for the first 24 hours the belt is worn.
Requirements Craft Wondrous Item, bulls strength; Cost 2,000 gp (+2), 8,000 gp (+4), 18,000 gp (+6)