Sweet Genes breeds two types of rats -- standard and dumbo.
Coats are primarily standard, but sometimes hairless and rexes are also available.

Standard type,

Standard coat

Standard type,

Hairless

Dumbo type,

Standard coat

Dumbo type,

Rex coat

(NOTE: If you are unfamiliar with the terms used to describe different types, coats, colors and markings, click here for the standards from the Rat and Mouse Fanciers for Excellence (RMFE) site.)