You are looking at a Rear Brake lever Extension, made out of 6061 aluminum and then clear anodized.
This extension is appx 2.5" long and installs with a set screw.
Fits the following BMW Models
R1200RT (05-13), R1150RT, R1100RT, R1150RS, R1100RS, R1100S
K1200GT (up to 2005), K1200RS
This brake extension comes in Silver, Black is shown only for display purpose.
Stock image used, actual product may vary slightly.