Slate CWS?????

[Lauren Bowman]

One of my gerbils, Matilda or Tilly is slate and white.  On a website i read and saw a picture and it fits her discription as a Slate CWS?  What does CWS stand for?  She has a white star on her head...and white band along her chest,  Thanks for your help.   Lauren "I'm an angel, honest! The horns just hold up my halo."