Shimano sm gm01 e tube di2 grommete tube di2 internal cable routing grommets to protect the wires as they enter the frame from snagging and provide a neat clean look to your di2 cable routing features protective solution that is quick and easy to install pack of 4a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano components from chain reaction cycles the worlds largest online bike store