TUSQ XL is engineered from the same material as TUSQ and is impregnated with PTFE which is five times more slippery than graphite | It has all the tonal benefits of TUSQ, bringing out the hidden harmonics of your guitar all while drastically improving tuning performance | TUSQ XL is consistent from piece to piece, and within each piece, to offer you harmonically rich tones without the problems associated with natural materials | Country of Origin: United States