Standard key of high D.
Generation whistles are made in England. They have a 2-octave range. They have plastic fipple (mouthpiece). The plastic fipple has become accepted by traditional whistle players over the years, because of the consistency of sound compared to a wooden fipple (wood can change tone when wet...). They have a cylindrical straight bore, requires little air. The mouthpieces can be loosened to make them tunable. These whistles have undergone a major redesign by Brian Howard and play better than ever. You will hear these whistles on 1000's of traditional Irish recordings.