Hi guys, in my opinion the Optima tenor Ds, fixed or tuneable, are the best entry model tenor D in the world giving you the chance to own a great sounding, easy to play whistle that doesn't break the bank. Just listen to the tone of Tobys' Optima in the video. The head is ABS plastic and the body is alloy.
https://www.kerrywhistles.com/product-page/kerry-optima-fixed-low-d