You're right - They are very beautiful and I like their construction. Radial flare, metal throat. Good dispersion and durable construction as well as being very attractive.

Martinelli's throat is billet aluminum with an O-Ring for seal with the compression driver. Super good stuff. And several woods and finishes are available.

I really like both the Martinelli and the Fostex wood horns you've shown here. I much prefer these kinds of horns to "salad bowls" - I prefer their response and their dispersion characteristics - Nice and wide, and with reduced floor bounce. Performance is good and the aesthetics are great.