Ambu Silicone Face Masks are self-inflating for an easy and tight seal. The cuff pressure may be regulated. The mask size 0 with boring impedes ventilation pressures higher than approx. 40 cm H2O, enabling ventilation with an Ambu Mark IV Resuscitator on small children with a body weight down to approx. 15 kg. (approx. 3 years). The transparent dome of the Ambu Silicone Face Mask enables you to check the patient?s condition, e.g. bleeding, vomit, spontaneous breathing and cyanosis. The transparent dome (sizes 6, 5, 4, 2 and 0) is made of unbreakable plastic (polysulphone). The texture of the surface of the Ambu Silicone Face Mask ensures that the cuff does not slip, and makes it comfortable to hold during use. The dome has been designed to allow a soft rest for the thumb, thus creating an easier grip and ensuring a tight fit on the face (sizes 6, 5, 4 and 2).