Dixon Round Fluorescan Crayons, 4-3/4" X 11/16" Blue Violet, Pack of 12 EASY GRIP - Round shaped crayons 4-3/4" long X 11/16" thick MADE FOR HOLDERS - Fits 11/16" lumber crayon holder Scannable with UV scanning equipment Will not bleed through to lower surfaces Brilliant colors. Water, smear and fade resistant