For 30 years, Jo-Ral founder Joe Alessi has been a designer of excellent mutes, adding refinements and innovation to create mutes that give superb acoustic and tonal performance. These designs have been used by some of the most respected, well-known and talented professionals in the music business. Jo-Ral mutes are made of the highest quality hand-spun aluminium and enable even performance in all registers. Additional metals such as copper and brass create a different type of muted effect (see individual descriptions below). The cork used by Jo-Ral is neoprene-enhanced, meaning that it is very durable and will not dry-out or fall-off while still creating a perfect fit.