A set of 20 round light-up balloons with built-in LED lights, supplied as the Colored Lights-20pcs variant. Material: Plastic (PVC). Each balloon has a round shape and inflates to 20 inches; helium is not included. Packed flat, the set measures 250x200x40 mm (approx. 9.8 x 7.9 x 1.6 in), weighs 420 g, and comes packed in plastic bags. Sizing guidance: inflate slowly and stop at the 20 inches round shape, since over-inflating stretches and thins the plastic. Care: wipe the surface with a dry cloth only, keep away from sharp edges, direct heat, and open flame, and store the balloons flat in their plastic bags out of direct sunlight. Remove the light units before disposing of the balloons.