Finish LineA(R) DOT 5.1 brake fluid is engineered to provide maximum fluid life and optimal braking performance. DOT 5.1 fluid is fully compatible with both DOT 3 and DOT 4 systems, yet far exceeds their performance. It features ultra low viscosity oils to ensure excellent operation even in the coldest of riding conditions. Features & Benefits: a Engineered for use in bicycle hydraulic braking systems a Formulated with low viscosity base oils and proprietary additives a Delivers advanced brake lever and pad retraction response a Compatible with DOT 3, DOT 4, and DOT 5.1