Aura strong (no school); CL 17th; Slot none; Price 9,000 gp (lesser), 32,500 gp (normal), 73,000 gp (greater); Weight 5 lbs.
The wielder can cast up to three spells per day as though using the Persistent Spell feat.
FYI: Lesser and Greater Metamagic Rods
Normal metamagic rods can be used with spells of 6th level or lower. Lesser rods can be used with spells of 3rd level or lower, while greater rods can be used with spells of 9th level or lower.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.