A Line Product
Flat Weights

1/2 x 1/2 x 3/16" 12.7 x 12.7 x 4.7mm (3oz 84g)
Walthers Part # 116-13000, p. 896 Walthers 2012 HO Scale Reference
A scale, $7.50, currently in stock at Walthers

 
An easy way to add extra weight to locos and cars. Lead is precut, with double-sided backing tape for easy installation. Thickness dimension includes tape.