Are they cotton reels or swingarm protectors Well, they are both really!!R&G Offset Cotton Reels protect the swingarm and core swingarm components from damage in the event of a crash, slide or drop. Doubling up as paddock stand bobbins too, they allow the motorcycles rear wheel to be lifted into the air with the use of a paddock stand to perform chain adjustments, chain lubrication and cleaning! This particular pair of R&G Offset Cotton Reel kit has been specially designed to move the Cotton ReelPaddock Stand Bobbin location further rearward as if paddock stand bobbins are installed into the OE swingarm position theyll impact the OE exhaust during suspension travel, causing damage and suspension performance issues.Suitable for the Yamaha YZF-R6 17 ,Yamaha Tracer 9 (GT) 21-, Yamaha MT-09(SP) 21- & XSR900 22-, XSR900 GP 24- models.