Six of the most commonly used keys of Promaster in their own hard vinyl carrying case. The case has a snap closure and foam cutouts to keep your harps secure. PROMASTER - Let's face it. A new harmonica line only come along every 100 years. So consider this a real opportunity to own the absolute best harmonica you've ever played. Our new Promaster starts life as a solid block of anodized alloy and free blowing brass reeds for superior sound projection. Their ergonomic covers are so easy to hold you'll never put them down.