This is a bottle of Trinity "Perpetual Motion" Ultra Lightweight Motor Bearing Oil. "Perpetual Motion" is an ultra light weight ball bearing oil that provides exceptional lubrication to high RPM bearings. Additionally, while it lubricates, it also purges the old oil from the bearing. The result is lower drag than Trinity's Royal Oil. "Perpetual Motion" works great for motor bearing and wheel bearings, and especially in 1/12 scale racing where low drag is essential.