[1958SelmerMarkVI]

The alto is only marked 6. It is made of hard rubber and generally looks better crafted than a typical no name piece. It measures .076".

The soprano is marked Matrix. It is also hard rubber. It has really scooped inner side walls, like an old 1920's piece, which I thought was odd for what otherwise appears to be a very modern piece.

 

[Jorns Bergenson]

I just received the "Matrix" soprano piece that you put up on eBay. I was planning on refacing it, but it is superb as is. Excellent facing curve, crafted rollover baffle, perfect tip rail, etc. The tip opening of 0.055" is much more playable than vintage closed-tip pieces.
Thanks for offering this little beauty on eBay.

This is the third mouthpiece I've bought from you lately, so I really need you to stop putting such nice stuff up on eBay, okay?
-Jorns

 

[pontius]

That alto piece body resembles a Duckoff - Zimberoff - maybe a piece from the same or similar blank?