D20:Ring of Clumsiness Cursed Item

Ring of Clumsiness: This ring operates exactly like a ring of feather falling. However, it also makes the wearer clumsy. She takes a ?4 penalty to Dexterity and has a 20% chance of spell failure when trying to cast any arcane spell that has a somatic component. (This chance of spell failure stacks with other arcane spell failure chances.)
Strong transmutation; CL 15th; Forge Ring, feather fall, bestow curse; Price 500 gp.

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System Reference Document -> Magic Items: Cursed Items