This is a Febi Bilstein CV Joint Boot, part number 173347. It is designed for the front outer placement on a vehicle and has an inner diameter of 26 mm and 84 mm. The material is thermoplastic. This kit includes a Febi Bellow Kit, drive shaft (173244) and Febi Molybdenum Grease (02582). OE numbers for comparison include Hyundai: 49594-2Y200 SK1 and KIA: 49594-2Y200 SK1. Please use the vehicle identification to confirm compatibility. The product is designed for original use and should be installed by a competent individual.