Perfectly sized for the 12" x 15" inch tray, this comb with various intervals of 'teeth' are used to comb through the paint floating on the surface to create a multitude of beautiful patterns. This package contains one water marbling comb.Details:11.5" comb length1.3" x 2.8" x 19.2" package sizeFor use with water marbling paints and 12" x 15" tray (sold separately)