Our solid perspex poles come in 40mm, 50mm & 60mm diameter. Rings can be either in perspex, or metal plated in chrome, brass, nickel etc. The brackets can be clear perspex, or you can have metal brackets.
You can also have double poles, so you can hang a sheer on the rear pole, and a working curtain on the front pole. The 40mm is normally used at the rear second pole, and you can have a 50mm or 60mm on the front. But you can if you wish, have a 50mm on the rear and front, or the same with a 60mm pole.