Manufactured from unbreakable pvc plastic they can be used over and over. To use simply fill with warm water, shape your vase, then re-fill with cold water to set. Stores flat ideal for mail outs or as a promotional gift with a bunch of flowers. The large print area is fantastic for printing with your brand name and for advertising your products and services. Stores flat and can fit into an envelope ideal for mail outs, promotional campaigns or as a promotional gift with a bunch of flowers. The large print area is fantastic for printing with your brand name and for advertising your products and services.