Bruggers they are a pair of Exposure Dave's and are a 2.0" wide retro NS tyre that retails around a tenner a tyre
There's been a lot of chat on here about them as they are usually the rear in a set of Chaz & Dave tyres, but they are new school tech in an old school look and stick like shite to a blanket on timber ramps, and are pretty damn good on concrete too
I know as I've got a few sets and so have a number of us now, including Jaymz who was first to road test them