Description
Two sizes in optional .
1. The bigger one: external diameter: 50mm;internal diamater:25mm
2. The smaller one: external diameter: 50mm;internal diamater:12mm

Small/upgraded Anesthesia Mask for Laboratory Use
Small/upgraded anesthesia mask for laboratory use, available in two sizes with external diameter 50mm and internal diameters 25mm (bigger) and 12mm (smaller).
Two sizes in optional .
1. The bigger one: external diameter: 50mm;internal diamater:25mm
2. The smaller one: external diameter: 50mm;internal diamater:12mm