Wegenpicks 3.5mm Black Gypsy Jazz Pick, Right-Handed Bevel - Single - GP350B 

From Wegen:

My standard gypsy picks are 3.5 mm thick, 30 mm long and 26 mm wide.The material used is sounding very close to tortoise , but it is lasting much longer. The pick has a nice beveled and curved tip, so it makes a difference if you're right- or left-handed. Both sides have grooves for grip, and the thumb side is concaved with grooves. I've improved this pick just a few times for the better, and my customers and I can't think of any more ideas to offer a better gypsyjazzpick.

Wegen picks are handmade in the Netherlands and are the ultimate plectrum for the discerning guitarist.