The type of bar you choose depends on your chosen genre and playing style. Glass bars are actually made with pyrex the majority of the time, though tempered glass versions are out there. Glass bars provide a smooth, warm tone. By contrast, brass bars illicit brighter sound with maximum sustain, and they can be coated in chrome or nickel to boost crispness. Finally, ceramics can create a variety of tones depending on the glaze type and sit between glass and brass in terms of weight. Choose the bar with the best fit for your style.