Beef up the front end of your XRay XB4 with these beautiful aluminum caster blocks from Exotek Racing. These blocks offer 12° of caster and weigh in at a light 6 grams each. They are black-anodized and are lazer-etched for easy identification.
1591 Exotek 12-Degree Aluminum Caster Blocks for XRay XB4
[source: www.exotekracing.com]