Material under Arcade Sticks

Does anyone know what the material sometimes used on the base of various arcade sticks is called or where I can get it?

Images in case it’s not clear what I’m asking about:

https://images-na.ssl-images-amazon.com/images/G/01/videogames/detail-page/B00AJGVGTE_ttt2_ps3u_05.jpg

Self-adhesive sponge neoprene… the ones in the Mad Catz TE2 fightsticks are 1/8" thick. You can find them on Amazon and eBay.

Looks like EVA foam on the Mad Catz sticks. It’s not great, but cheap.

I use PU foam on my Panzer stick. It’s durable and you can get it different firmness.
https://www.amazon.com/Polyurethane-Open-Cell-Firmness-Adhesive-Thickness/dp/B003VYAXL8/ref=sr_1_9?s=industrial&ie=UTF8&qid=1467959645&sr=1-9&keywords=Poron+Polyurethane+Open-Cell+Foam+Sheet

edit: new link. this has an adhesive backing.