600 D Color Code: 600 D Category: Opal D-Density Description: Light Grey with swirled dense White Pattern: Smooth Price Level: E AllGray 503 – LLBrown, Gray, Streaky LL-density WO 502Brown, Gray, Wisspy Opal WO 503Brown, Gray, Wisspy Opal 600 DGray, Opal D-density 503 DBrown, Gray, Opal D-density 502 – DBrown, Gray, Opal D-density