The "wrap" refers to how the tubing is coiled, which affects the instrument's resistance and sound.

Lighter than a full double; shares some tubing between both sides.

Lighter and offers better security in the high register.

The 4th valve is located below the other three, in-line with the air column. These typically offer a brighter, more focused sound and less resistance, found in models like the Yamaha YHR-671D . 3. Consider Materials and Features Choosing the Perfect French Horn for Your Beginner