Material: Leather and brass. Super soft and strong rolled leather collar with solid Brass fittings. Rolled leather reduces matting and tangling of hair under the collar due to the rolled edges. Recommended for long hair dogs. Size guide: XS 21-27cm, S 25-33cm, M 35-44cm, L 41-49cm, XL 51-59cm, XXL 61-69cm. Ref: UTWB1256