Rolled Round Soft Leather Dog Choke Collar Soft Padded Size XSmall to XLarge Breeds Black (14 inches Width 5/16 inch Reference # 7510) Size XS1 length 10 inches (25cm) width 1/4 inch (6mm) reference # 7508 Widest inner circumference: 8" (20cm). Size XS2 length 12 inches (30cm) width 1/4 inch (6mm) reference # 7509 Widest inner circumference 10" (25cm) Size L1 length 22 inches (55cm) width 1/2 inch (13mm) reference # 7518 Widest inner circumference: 20" (50 cm). Size L2 length 24 inches (60cm) width 1/2 inch (13mm) reference # 7522 Widest inner circumference: 22" (55cm) Size S1 length 14 inches (35cm) width 5/16 inch (8mm) reference # 7510 Widest inner circumference: 12" (30 cm). Size S2 length 16 inches (40cm) width 5/16 inch (8mm) reference # 7515 Widest inner circumference: 14" (35 cm) Size XL1 length 26 inches (65cm) width 1/2 inch (13mm) reference # 7523 Widest inner circumference: 24" (60cm). Size XL2 length 28 inches (70cm) width 1/2 inch (13mm) reference # 7524 Widest inner circumference: 26" (65cm) Size M1 length 18 inches (45cm) width 3/8 inch (10mm) reference # 7516 Widest inner circumference: 16" (40 cm). Size M2 length 20 inches (50cm) width 3/8 inch (10mm) reference # 7517 Widest inner circumference: 18" (45 cm)