The treads are laminated from Superform bending plywoods, in the process the teak Perform veneer
is applied at the same time, other species of wood are available.
We offered them via the blog, held onto the jigs for a year or so, then dumped the jigs and we received an order from the USA, which was too late with the jigs gone!
We now have a new enquiry and from the UK, the shape of the treads is different, they have the ends turned up with flat treads between. If that becomes an order we will again have jigs once more.