Ballast is rock used to hold railroad ties in place & great for modeling gravel roads Available in several colors & sizes Mix & match for a realistic effect The product is lightweight & easy to use Attach with Scenic Cement Bags 18 cu in & 45 cu in Gray Blend only Shaker 50 cu in Grades Fine Medium Coarse SCALE REFERENCE CHART BALLAST SCALE FINE MEDIUM COARSE Z 2273 7311 11183 N 1653 538 8133 HO 929 2943 4472 S 621 2132 3253 O 516 1624 2439 I 31 1116 1626 G 248 812 1219 SCALE REFERENCE CHART COAL SCALE Mine Run Coal Lump Coal N 012 820 HO 06 410 O 03 25