Easy spring-rate adjustment helps fine-tune sag, support and ride feel without swapping springs. These Sprindex adjustable coil springs are used with Vorsprung Telum rear shocks and come with Vorsprung branding in place of the standard Sprindex logo. There is no performance loss or gain from the branding change, it is simply the version supplied for the Telum. They still include the required spacers to fit RockShox, Fox, Marzocchi, Cane Creek, Öhlins and DVO rear shocks.