The BSL oil from BORED Japan, is an all-round use oil which we mainly use for chains, but it can also be very useful for other parts of the bike, such as inside sealed bearing cartridges, on rotating or swivelling surfaces on brakes, derailleurs, levers etc. We have other options which are thicker or thinner oils, but this one is a good one to start with if you only want to buy one type. The bottle is a 'dropper bottle' type. This is a premium quality race-grade lubricant. Made in Japan.