A semi-professional or intermediate clarinet is generally considered a high-quality instrument, offering a clear, precise sound and easy response, but without reaching the performance and quality levels of a professional clarinet. It's suitable for musicians who are looking to improve their playing without having to spend a considerable amount of money on a professional instrument.

The characteristics of a semi-professional or intermediate clarinet usually include silver-plated brass keys, high-quality pads, carefully selected grenadilla wood, and precise key mechanism. These instruments also offer easy response, stronger sound projection, and better intonation compared to student models.

There are many musical instrument manufacturers that offer semi-professional or intermediate clarinet models, and it's important to choose a brand and model that suits your playing style and individual needs.