Tapered-end mask: 350ml volume; clear, hard plastic wall; soft, black rubber diaphragm; for medium to larger dogs with pointy nose e.g. Border Collie, also pig snouts

Polycarbonate Mask: opening 90mm (3.5") ID, internal depth = 90mm; silicon diaphragm with 45mm (1.75") aperture; breathing circuit inlet 22mm F with connector 22mm M/15mm M & silicon head strap.