The Muc-Off Bio Dry 120 ml Lube is a durable, deep penetrating Chain Lubricant and oil that is formulated to hold up in extreme conditions that would destroy ordinary chain lubes. It is a highly versatile, dry weather chain oil that has state of the art penetrative qualities to ensure that the lube is driven deep into each chain link's core. The Muc-Off Bio Dry 120 ml Lube features biodegradable content, so it's safe for you, your bike and the planet.