Graphite front arm brace for greater flex adjustment possibilities. MEDIUM â€✠With brace Improves in-corner steering but keeps a moderate response to steering input. Recommended for medium-high traction carpet tracks and high traction asphalt tracks. STIFF - With brace connected to front central bulkhead Provides maximum steering response. Recommended for low-medium traction carpet tracks and for all different traction levels on asphalt tracks. CNC-machined from 2.2 mm high-grade carbon graphite.