We have two sets of these...one set of (4) for 15" tires, plus three spares for a total of (7) 15"Portawalls, and another set of (4) for 14" tires. These are the genuine article as sold in the back of the Hot Rod magazine in the 1950's and 1960's. You simply let the air out of your tires then installed these between the tire bead and the rim, then aired your tires back up. You had instant whitewalls which immediately made your car look "cool" without having to shell out big bucks for new whitewall tires.
In reality... lots of these were sold by default. If you went around a corner to fast they would pop loose from the bead and pass you going around the corner. Then you had to by another set because you couldn't drive around with three whitewall tires and one blackwall! That explains how there got to be (7) of the 15" Portawalls. With that in mind these make great wall are in your shop as you tell your friends and neighbors they came off of your 1950 Olds and then follow up with your past Saturday night adventures stories. The entertainment value alone makes these worth more way more than the $24.80 asking price for both sets FOB Clay Center Kansas.