This review is for the 350# Alpha bumper set consisting of 4 x 45, 2 x 35, 25, 15, & 10 pounds. The set was delivered individually boxed by UPS to my garage and arrived in great condition. The rubber smell is strong at first but fading quickly. The weights have a thin oily layer on them which I wiped off with soap and water on a rag easily. Overall, I am very impressed and can't wait to use these all the time in my new home gym. I've yet to really try them out, I have no intention of using on anything other than stall mats and concrete floor but they look bomb proof.