There are 2 types of pro window 12'', both the same brush type, the black one designed by Varitech,
with the space for fan jets, pencil jets and their goose neck.
Then theres the grey one which has goose neck settings for most goose necks, then 2 choices of fan jet holes and two choices of pencil jet holes, this was jointly designed by us and WCW, it is a good value universal brush, which like most thing's in this industry has positive and negative feed back, but on the whole we've had a good response.
due to the holes on the grey one, it is slightly lighter than the black one.