Por MrSmith17/12/2017Typical sponge foam with 3M duct tape on the back side. Good quality. In my opinion they could be a bit smaller. Make sure you order some more or buy the big package >>> https://bit.ly/LandSkid because 4 pcs are not enough. If you use a x-frame buy this one instead >>> https://bit.ly/Gear25
Por rayanashraf03/04/2020perfect replacement 3m is good . recommend 100%