I don't like the use of the word "plastic" in the description. It's difficult to sell a "plastic" construction. Nylon is a plastic, but super plastic, hence "nylon". The compression characteristics they show lead me to believe this is a higher quality urethane. These jaws were made for my 6" wood vise. The perfect addition. The magnets stick really well and I was impressed with the new ways my vise can now hold things. The charge is less than £10, and the premium delivery is for me the payment on the back.I just added another one to the cart because I don't see any others with that dollar value.