They have a laser measrued smooth cut Hardboard core, outer layer of acoustic dampening foam, an acoustic and vibration dampening base, covered with an felt/nylon cloth 99% colour match to Z boot interior and a cut outer lining too make the outside seamless.
Sturdy, it's solid as fook, but soft to the touch.
Deliveries will be on a Nextday UK wide basis, so if you do place an order (when I get the stock delivered) we can deliver to home or work 5 days a week for free.