What kind of ring is square?

More brain teasers

• What has 88 keys but can't open a door?
• What goes up and down but never moves?
• What is sticky, sweet, and made by something that buzzes?
• What pumps blood around your body?
• A man says, 'Yesterday I was 7, and next year I'll be 10.' How is that possible?
• What kind of berry tells time?