The color of Custom Pistons ,here are some common piston coating we provide.
1, Coating-Free Pistons, the piston surface has no coating . ( Natural steel )
2, Monochrome Pistons ,the piston surface is coated with a single color.( Coating meterial : PO4 3)
3, Bicolor Pistons ,the piston surface is coated with two different colors. ( Coating meterial: MoS2 )
Notice: This pistons for BMW B48 have natural steel or with coating, please contact our sales