U.S size or letter size label on each crochet Bella"s ultra smooth premium bamboo crochet hooks Natural finish 10 sizeE-NLength : 6 inches size E 3.0mm size F 3.75mmsize F 4.00 mm size G4.50 mm size H5.00 mm size J 6.00 mm size L 7.00 mm size L8.00mmsize M9.00 mm size N 10.00 mm