Folliman is right--custom provides choices in density, color, exact base size, and base material. Also, on a custom unit we can get the exact hair length you want---the stock units all have 6" hair and that's a lot for some people to walk into a stylist with. And in custom pieces we can add gray exactly as you specify it which means if you want more gray in the temple area we can do it. Usually stock colors can work for most people but if you happen to have a hair color that is mid-way between two colors we can match that exactly with a custom unit by blending the two colors. Oh, and one other thing. Some people want no crown or a non-graduated front---again we can do this only with a custom order.
Regards,
John
http://www.toplace.com/