These cylinders are reinforced with a sturdy, plastic mesh (netting) cover. Great size for making evergreen Kissing Balls. Use with Kissing ball frame item KKB01-72. These cylinders are made of a water absorbent floral foam for centerpieces and floral arrangements. First soak the foam, then insert the stems of the plant material for your centerpiece. The floral foam will help your centerpieces last longer.