The Vevor 6-inch curb ramp is made of sturdy rubber, yet is lightweight to be transportable. They weight about 30 pounds, but can withstand the weight of my Ford Expedition, Dodge Ram 1500, 900cc motorcycle and/or my motorcycle trailer. Well-made. They have a strong rubber scent out of the box, but I left them outside to air out and in a couple days, did not notice the smell. Also, they come with 4 bolts to semi-permanently secure them to the concrete/asphalt. I didn't use them, however, in favor of transportability and HOA requirements not to have any freestanding items in the street. I highly recommend if you need a reliable way to get your vehicles up a curb without damage!