SRD:Bracers of Armor
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Bracers of Armor: These items appear to be wrist or arm guards. They surround the wearer with an invisible but tangible field of force, granting him an armor bonus of +1 to +8, just as though he were wearing armor. Both bracers must be worn for the magic to be effective.
Moderate conjuration; CL 7th; Craft Wondrous Item, mage armor, creator’s caster level must be at least two times that of the bonus placed in the bracers; Price 1,000 gp (+1), 4,000 gp (+2), 9,000 gp (+3), 16,000 gp (+4), 25,000 gp (+5), 36,000 gp (+6), 49,000 gp (+7), 64,000 gp (+8);Weight 1 lb.