Pesco New 2 Rows Mushroom Rivets Studded PU Leather Dog Pet Collars 7 Colors 15-20" Brand new high quality PU leather dog collars, soft and skin friendly. Provide security guarantees to your pet. 2 Rows Mushroom Rivets Studded Small: 1.3"(3.2cm)width, 20"(51cm) total length,neck size for 15-18"(38-46cm) Medium: 1.3"(3.2cm)width, 22"(51cm) total length,neck size for 17-20"(43-51cm)