All you'll need to refresh your Chain Damper as the consumable parts begin to wear out. 
 
Contents: 
4x Low Friction Thrust Bushes
2x X-Rings
1x O-ring
4x Elastomers (plus 4 spare elastomers)
 
Consider replacing your Chain Damper Chainring whilst it's apart, worn chainrings make more noise, wear out new chains faster and are more likely to cause chain drops.
 
Click here for a service guide