Öhlins, STX36 Twin rear shock absorber set 329mmBlack springs Clear body Piston diameter: 36mm S: Single tube body D: Mono type high pressure gas type shock with internal reservoir in the main body R1: Adjustable rebound damping L: Adjustable length Length: 329 +5 5 mm Stroke: 77 mm Rate N mm: 25 N mm Mounted spring: 00280 21 Packaging unit: pair ABE approved. These STX36''s are designed to replace the dual shock absorbers on Touring models for comfort and improved rideability of your bagger.