This is the WD-40 Dry Lube which has been developed for keeping the chain lubricated in dry & dusty conditions. Its quick drying formula leaves a protective film, providing long lasting lubrication and protection. For dry and arid riding conditions. Extensively tested by scientists and pro mechanics alike. Special polymers form a dry film to protect your chain and repel dirt in arid or dusty conditions. The Formula means that the lubricant does not attract as much dust and dirt that a wet lube would collect on a dry day. The result is a clean, quiet and long lasting drivetrain.