From the Le Games website -
17 Magic Rings is the latest book in our "17" series, and it's going to make you shout "yahoo!". Each magical ring contains flavor material, d20 rules, creation costs, and a market price! Also included is bonus material from PIG games -- Disposable Heroes!
Wait! There's more! This book actually contains 18 magical rings! Yes! We said 18! In bold text too!