Read the advertisement very carefully because the product on sale varies according to the final number of the product code in question (01 or 02 or 03). Technical features: shock absorber body in high resistance alloy steel and heads in aluminum alloy machined from solid with CNC machining. Spring colour: depending on the type of bike (sports, classic or custom) they are made in the “01” version with red spring, the “02” version with black spring (visible in the photo) and the “03” version with chromed spring.