If your goal is , the acoustic tube is the "better" choice. It uses a clear plastic tube that delivers sound directly into the ear canal.
If you like the D-shell shape but keep breaking them, look for aftermarket versions. Brands like Klein Electronics or Impact Radio Accessories make versions of the HMN639 with thicker cabling and "strain relief" at the connection points. C-Ring Earpieces hmn639 better
Here is a comprehensive look at how to get a "better" experience out of this specific radio accessory. If your goal is , the acoustic tube is the "better" choice
HMN639 Better: Upgrading Your Two-Way Radio Audio Experience If your goal is