Dolly Track comes in both Heavy Wall and Stainless Steel options; please note Matthews does not recommend combining the two.Matthews manufactures and supplies the industry with both Heavy Wall and stainless steel Dolly Track. Heavy wall is manufactured from 1-1/2" diameter steel tube and is chrome plated to protect it from negative environmental effects. It is slightly less expensive than stainless steel track. Stainless steel track does not require plating. Due to the inherent characteristics of the material, it is impervious to the elements. Additionally, all Matthews track now has black cross members.