Maintenance kit for Piaggio Fly 50, Derbi Boulevard 50 4-stroke 2- and 4-valve engine -2011. The kit includes all the parts necessary for maintenance. Vario weights: 6.4g All its parts are original replacement parts from Piaggio. Perfect fit and top quality. Delivered as shown. If you like to keep on top of your servicing, this is the kit for you. In addition, the kit saves you having to buy the individual parts.