Hi Ranger XT - Hose Cover - (Knuckle End) - Plastic *There are 2 of these covers at the knuckle, one on the lower boom and one on the upper boom. Covers are sold individually. These covers are made from polyethylene which is the same material as a bucket liner. This allows the cover to be more flexible to absorb minor impacts. The clear plastic version is much more brittle. Almost half the cost of buying OEM!