Whether you’re decorating for a magical themed party or just want an eye-catching backdrop, these balloons are sure to make any event extraordinary. With their lasting, efficient design and unrivaled durability, you can count on them to stay afloat all day/night long! Plus, with their festive shiny finish, they show up beautifully in photos too. Balloons have a metallic black base and are made from natural rubber latex. Printed on the balloon in white are multiple number 70s with stars and swirls. Balloons are of helium quality and can be inflated with either air or helium. 70th birthday balloons measure 12” (30cm). Balloons are 100% biodegradable.