● transparent, non-toxic pvc
● two diluters, seven concentrations can be adjusted,green diluter: 24%, 26%, 28%, 30%,white diluter: 35%，40%，50%
● adjustable nose-tip
● 5 inch quincuncial anti-crash oxygen tube
| model | size |
|---|---|
| a038108 | xl |
| a038208 | l |
| a038308 | m |
| a038408 |
s |
