MATERIALS: The Halloween Balloons kit is made of high quality material - durable natural latex and thick aluminum film, which is safe to be used for children. they can hold the air for a long time if you tight knot after inflate the balloons. EASY TO ASSEMBLE: The Halloween Balloon Arch provides a complete balloon strip kit to help you make balloon garlands or arches more easily. It is recommended that when inflating the balloon, do not overfill to avoid an explosion. USAGE OCCASION : Our party balloons are perfect for halloween theme, they contain various horror elements. It can make the party full of festive atmosphere. The pack is also perfect for Carnival, masquerade party, Children's themed birthday party and any special events to make you an unforgettable party, you can decorate it in the garden or use it indoors.