Ring of force shield
(Dungeon Master's Guide v.3.5, page 232)
Price (Item Level): 8,500 gp (12th)
Body Slot: Ring
Caster Level: 9th
Aura: Moderate; (DC 19) evocation
Activation: Free (command)
Weight: —
An iron band, this simple ring generates a shield-sized (and shield-shaped) wall of force that stays with the ring and can be wielded by the wearer as if it were a heavy shield (+2 AC). This special creation has no armor check penalty or arcane spell failure chance since it is weightless and encumbrance-free. It can be activated and deactivated at will as a free action.
Prerequisites: Forge Ring, wall of force.
Cost to Create: 4,000 gp (plus 500 gp for base item), 320 XP, 8 days.