Top-grain bridle leather. Top-grain bridle leather dog collar. Leather collars ought not be saturated with water. Available in size 1 (20-26cm), 2 (26-31cm), 3 (28-36cm), 4 (35-43cm), 5 (39-48cm), 6 (45-54cm), 7 (50-59cm), and 8 (55-63cm).