With a highly responsive medium weight top for accurate sticking response, and a heavy bottom boosting clarity and cut, this pairing is very versatile. Crafted using an innovative manufacturing technique, Xs20 delivers bright sounds, professional looks, and great feel at a nice price, making this the ideal choice when you discover that sound matters.Medium weight top Heavy weight bottom Modern style Bright sound B20 bronze: 20% tin, 80% copper with traces of silver Brilliant finish