D. Bonade makes the industry's most comprehensive range of inverted metal ligatures and caps, and they are all super excellent. They come in a variety of metals and finishes, which some claim affects the sound, but if so, I think that is due to weight vs. material per se. Nevertheless, I go for Gold or Rose Gold when available for a specific instrument (not every instrument has all options available).
If you are not familiar with so-called "inverted" ligatures, they have a protrusion where the reed slips through, and the fastening is done on the back side of the mouthpiece. This makes for more confident tightening, less wear on the reed, and freer and more consistent vibration of the reed. It is also meant to get close to the German system of tying strings around the reed as the ligature, without the extra hassle that involves. I've gone through literally every type of ligature there is, and for low horns, the inverted metal ligature is the best.
This is a separate ad from my Leblanc alto clarinet as these are expensive and hard to get, and most people have already made their minds up about stuff like this, so whoever buys that horn is unlikely to want this ligature and I'd rather it go to someone who knows they want it than have it be cannibalized or thrown out.
The ligature goes for $69 new and the cap goes for $31 new, for a total of $100.
The manufacturer of D. Bonade gear is Herouard & Benard in France.
The ligature is D. Bonade L2252UPO Alto Clarinet Ligature – Inverted (Brass w/ Rose Gold Lacquer).
The ligature cap is D. Bonade C2252UA Alto Clarinet Ligature Cap – Inverted (Silver Plated).
Optional Vandoren reeds at 2-½ and 3 strength can be included in the package to save on postage. The estimator doesn't show for below a pound so I am tagging on a fixed shipping cost, but my flexible pricing accounts for this.