Flex Head Tees
These are really nice. Guaranteed against breakage for life (but don't lose them or you're out of luck). Consistent height every time, bright colors (so you don't lose them), and the ball stays on the tee. I highly recommend them.
Flex-Head G3 - Flexible, Unbreakable Golf Tees
The Flex-Head G3 is a flexible golf tee that is guaranteed to be unbreakable for life. It comes in eight sizes to accommodate any club or situation.
www.flex-head.com