Straight back surprise towers are redesigned permitting the Horizontal split Bulkheads (HS), while having denser top surprise mount functions to have extra accurate set-up alterations. A sizable component surprise tower features additional roll center jobs also for lots more fine set-up modification furthermore extra wing mounting functions. Right back shock towers are machined from premium-grade 3.5 mm graphite and they are lightweight & strong, with numerous surprise jobs and roll center modification functions Fits XB4'21