XRAY made Aluminium Steering Block Black Swiss 7075 T6 (302257) T4 2020 Specs (300026) (300027) T4 Series Aluminum steering block CNC-machined from premium lightweight T6 aluminum. Ultra-strong construction provides very long life and durability in even the most extreme racing conditions. Composite bushings are used to secure the ball-bearings in both sides of this steering block; this allows the ball-bearings to fit perfectly and turn freely, giving much higher lifetime compared to bearings installed directly into aluminum steering blocks.