Pastel Matte Yellow latex balloons are Ideal for lots of uses.Use these to create stacks, collars, arches or to add finishing touches to your design! Sempertex Balloons are made from pure, natural rubber latex. No fillers, extenders, plasticisers or any cost-reducing agents are used.These balloons have excellent helium and air retention due to a high-tech and sophisticated molecular cross-link, which creates a high quality barrier, reducing gas permeability. Low burst levels are achieved by great elasticity of the rubber film. Long Helium Flotation or Air Inflation = Long Lasting Décor.