I know of one other drip tip manufacturer that has a tip with sleeves, one of the sleeves is brass.
Brian at Drip Tip Designz makes SS core DT's with brass and brass braided sleeves (among a host of others) and will do custom to your design. He's made a bunch of custom tips for me, is very fast to make and ship (sometimes the same day), has exceptional customer service and is just plain a nice guy.
Custom Drip Tips
Here's what I have coming to accent my PAPS SS's and LUX's on my 4 Herons... 2 SS and 2 Brass 22mm (+ 2 all SS for the Spheroids).


Drip Tips | Stainless Steel Drips Tips | Brass Drip Tips
EDIT: There was an email and shipping snafu that our own fantellie in the UK singlehandedly got straightened out for me. When I know the bottom line I'll fill you all in on the details. But for starters, fantellie is jewel and ST's customer service is top drawer.
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