I have a collection of junk penny whistles but these are of a high quality, Mouthpiece can be removed for cleaning ( and tuning) like a recorder

The mouthpiece, placement of the six holes and the overall balance and feel is really good for each whistle - the C and D tuned versions

I love the mouthpiece and it does not have any separation in the back like the tin

The C is a little sharp, but it is somewhat tunable, The D's not as internally in tune and is a little more shrill, but it's not a bad whistle by any stretch