DPSS-B/R-T - Dalton Black/ Red secondary spring
See this product page at Dalton Industries for complete information
Different tire sizes and components in some of the clutch kits for 2016 Polaris RZR models have different requirements. In some kits, like the RZR S 1000, you can convert your clutch kit to another application with a different secondary spring. The instructions may call for a particular set up using this spring when using different tires or conditions.
Springs are part of a complete tuning package, and the required spring is dependent on the rest of the tuning components used.