Made of laser-cut hardboard with white finish on one side and natural finish on the other. Holes are 1 inch diameter for 1/2 oz (17 ml) bottles; 1-7/16 inch dia. for 1.18 oz (35 ml) or 2 oz (60 ml) bottles; 2-1/8 inch diameter for 6-3/4 oz (200 ml) bottles. Designed for Acrylicos Vallejo paints, but may used with any other brand of model paint jars. Not for use with large diameter texture paint jars. Front Module holds fifty-two 1/2 oz bottles, eight 1 or 2 oz bottles, plus 22 brushes. 13-3/8 inches wide x 8-7/8 inches deep x 4-1/4 inches high.