Kit includes - easy to operate helium-filled tank, 30 assorted 25cm balloons, spool of ribbon. This kit will fill approximately 30 x 9" / 23cm latex balloons OR 16 x 11" / 28cm latex balloons OR 16 x 18" / 46cm Foil Balloons Latex Balloon float time is approx. 5-7 hours This tank contains 7Litre / 0.196 cubic m of helium.