Are they cotton reels or spindle sliders? Well they are both really!! The cotton reel is mounted to a special aluminium bracket (included with the kit). Due to the position of the cotton reel on the bracket, these protectors give protection to the swingarm area and the bike can be lifted using a paddock stand. This product overcomes the lack of mounting lugs for standard bobbins. Suitable for the Yamaha YZF-R125 '08-, Yamaha MT-125 '14- & Yamaha XSR-125 '21- models.