So my Gm is letting us use custom items so long as we do the math right and frame it as if we found it in a rule book. I ran by him an on command ring of enlarge person. He said OK as long as it was a once per day activation. I just would like if someone could double check my math because this seems way to cheap for what I'm making.
Weak Ring of Enlarge Person
Aura Aura faint; transmutation; CL 1st
Slot ring Price 4000- gp;
DESCRIPTION
On command, this mundane looking iron ring allows the wearer to use the magic spell enlarge person on themselves once per day.
CONSTRUCTION REQUIREMENTS
Forge Ring, enlarge person; Cost 2000- gp