American Z Line ~ Z Scale ~ 4180 Airslide Hopper ~ 2-Pack ~ KATY #9123 & #9126 ~ 916044-1
​ AZL is including optional NO-SWAY™ bolster pins with each set. Due to the high amount of detail on the undercarriage, the cars may sway slightly. By replacing one bolster on each car with the NO-SWAY™ pin, the sway will be eliminated.