FLORACRAFT-Styrofoam Vase Insert. Styrofoam is the perfect base for all floral and craft projects including home decor items and memorial vases. It is available in a variety of durable pre-cut shapes and sizes to meet any design need. This vase insert has a 3-1/4 inch square top that transitions into a circular shape after 2 inches. The cylinder portion is 6 inches long, it starts at a diameter of 3-1/4 inches and tapers down to 2-3/4 inches. The overall dimensions of the entire piece are 8x3-1/4 inches. Each package contains one green Styrofoam vase insert. Made in USA. d.