Skunk2 Alpha Series Honda B18A/B Connecting RodsAlpha Series Rods are forged from select 4340 chromoly steel and feature an H beam design, resulting in the ultimate strength to weight ratio. 4340 chromoly is one of the strongest materials available, however, not all 4340 chromoly is the same. As such, Skunk2 relies on extensive material testing and works closely with its foundry to produce high quality rods at an affordable price. Comprehensive heat treating, tempering, and shot peening processes