This is a bottle of Shimano Hydraulic Mineral Oil for Disc Brake Systems.
 
Shimano hydraulic mineral oil  is formulated for the proper maintenance of Shimano hydraulic disc brakes - Shimano recommends that you use only genuine Shimano hydraulic mineral oil in Shimano hydraulic disc brake systems. Mineral oil brake fluid is environmentally safe and non-corrosive.
 
Features: 
Exact formula specification of Shimano manufacturers to give maximum performance and long-life.