I got a newletter today from Sax.co.uk. I like thier newsletters. And I also like Keilwerth saxes. I have newer tried a SX 90R Shadow tenor. So what's it like? Solid nickelsilver body? Anyone who knows formula of the SX 90 R Shadow nickel silver alloy (c 5-30% zink, 50-70% copper, 12-18% nickel)? This must be a very good alloy for a sax. Less or no corrosion on this saxes!