Types of frisbees:
Ultimate: 175g. This disc has a larger diameter and more even weighting to improve control.
Freestyle: 160g. This disc has more weight around the outside to help make clean throws from awkward trick positions (under the leg, etc.)
Golf: 150g. While there are as many kinds of golf disks as golf clubs, the standerd is this disc. It's smaller and denser than other discs which makes it go far, and dead straight.
Frisbee Dog: 110g. This disc is softer and lighter to avoid tooth damage.