Features: TD4 Stabilizers x2 (one for each front and rear) Soft (1.1mm) and Hard (1.3mm) Stabilizer Rods x1 each (different shapes for front and rear). These stabilizers facilitate smooth and stable cornering. Aluminum hex head ball connectors help with minute adjustments to left/right balance. Compatible with TD4 chassis cars. Overview: This Hop-Up Option is for use with the TD4 chassis. It provides superior cornering stability by controlling how much the cars suspension leans into a turn without sacrificing suspension dampening.