All of our coil shocks have a white "Legend" logo stamped on them, and following "Legend" is a number, either 110, 130, 450, 550, 850, or 1000. 

On all of our REVO, REVO-A, and REVO ARC shocks for FL Touring, Dyna, V-rod, Sportster, FXR, and Street models, the "Legend110" are the Standard-Duty Spring, and "Legend 130" is the Heavy-Duty Spring. 

On the REVO-A Softail shocks 2000-2017, if the springs say "Legend 850" those are the Standard-Duty Springs, and "Legend 1000" is the Heavy-Duty Spring. 

On our Revo-A Softail Mono Shock 2018+, if the spring says "Legend 450" this is the Standard-Duty Spring, and "Legend 550" is the Heavy-Duty Spring.