1. Quality: A good violin bridge should be made of high-quality materials, such as maple or beech wood. Bridges made of good material can make the strings produce better sound.

2. Manufacturer: When choosing a good violin code, you can consider choosing products from well-known brands. These brands usually have stricter production standards and better after-sales service.

3. Hardness: A good violin scale should have appropriate hardness and should not be too hard or too soft. A bridge that is too hard may cause the strings to make a harsh sound, and a bridge that is too soft may affect your playing skills.

4. A bow that suits you: Different bows require different types of violin keys, and different violin keys will also affect the sound effects of different types of bows, so choose a violin bow. You also need to consider your bow type and quality when coding.

5. Price: Good violin keys are more expensive, but you also need to choose the product that suits you according to your own budget.