Mugen Seiki Rear Damper Spring 86mm/1.6/10.5T (1pr): X8R/8RE/8/8E, X8T/E

Mugen Seiki Rear Damper Spring (Soft, 86mm, 10.5T) (2)

This is a pair of rear black shock springs. 1.6/10.5T: 1.6mm spring size and 10.5 turns of coil on the spring. More coils equals a softer spring, less coils equals a firmer spring: X8R/8/E, X8T/E