The CE certified swimming aid from RESTUBE. Pdf by RESTUBE is a certified 50N class buoyancy aid (DIN EN ISO 12402-5). It provides 75N actual buoyancy after manual triggering if worn directly at the body. Pfd from RESTUBE is mainly used for small boats as well as for stand-up paddling if the local regulation demand. Please check your locally regulations. Pfd from RESTUBE is reusable by screwing in a new original 16g CO2 cartridge.