Single Source Party Supplies - Round 11" Fashion Gray Latex Balloons Bag of 10 11" Qualatex Latex Balloon. Qualatex balloons are manufactured to exacting quality standards and are considered "The Very Best" balloons you can buy. We have a full color range of Qualatex balloons available in all colors / shapes and sizes! Be sure to search our Amazon store for all your requirements! Qualatex Balloons are manufactured in the U.S.A. and will hold helium and will float longer than cheap foreign made balloons - the latex is thicker slowing oxidization and the release of helium - resulting in much longer float times. Increase float time by up to ten times using an amazing product called Hi-Float - it coats the inside of the latex balloon slowing oxidization - average float time of an 11" balloon increases to 10-14 days. We've had them float for up to 45 days (temperature and humidity will affect float time - we make no claim to actual float time you will achieve)