Key Features of EP Front Spindle Bobbins for the Yamaha MT-09 Bobbin comprises nylon outer with aluminum core Connected using a rolled-thread spindle rod Fits simply through front wheel spindle Replacement nylon bobbins can be purchased separately Produced from engineering quality materials by Evotech Performance What is Spindle Bobbin Crash Protection? EP Front Spindle Bobbins for the Yamaha MT-09 are designed to protect the front wheel spindle retainers, brake calipers and fork lowers. As they stand out from either side of the wheel, the bobbin heads are expected to take impact first in an incident with the dual materials offering durability and strength. Furthermore, the nylon bobbin heads are free to rotate above the aluminum inner to reduce stress on the wheel. Easy to follow online instructions to aid hassle free installation. Make your Yamaha stand out from the pack!