Had them on a fretless, didn't like them, then on a Fender P, and while they were nice, just not for me. They were on the P about 2 weeks, before I pulled them and put them in my parts drawer. Only time they were played out, was at the Cincinnati Gtg. D'Addario ECB80 XL 40-60-75-95. Specs from D'Addario Code: Diameter Tension Item# Note inches mm lbs kg CB040 G 0.040 1.02 37.6 17.05 CB060 D 0.060 1.52 45.2 20.50 CB075 A 0.075 1.91 36.4 16.51 CB095 E 0.095 2.41 35.2 15.96 $15.00 shipped.