Cleartone Heavy Series are designed for people that play hard. Very Hard. Made by Cleartone, the leader in Premium Guitar strings. With heavy duty reinforced construction and enhanced core-to-wrap ratios, Cleartone Heavy Series are designed to be more powerful in every aspect. All six strings have the patented Cleartone Volume BOOST treatment, which makes the strings up to 10% louder than uncoated sets and 36% louder than the leading coated set Your new set of Cleartone Strings also feature our Tone LOCK technology to keep your strings sounding brand-new up to 5 times longer.