Wreath Base is 21" in Diameter x 3" Width x 2.75" Height with an inside Diameter of 15". Soak OASIS Soak Biodegradable Floral Foam SOAK IN WATER BEFORE before inserting Evergreens & Flowers Use the FLOAT-SOAK method to hydrate biodegradable floral foam with water, lay the biodegradable floral foam atop a basin of water and allow foam to fully saturate, approximately 2 minutes. Do NOT push foam under water. Made in the USA - Biodegradable OASIS Floral Foam infused with Maxlife preservative is secured with clips to a sturdy, green plastic base. Biodegradable OASIS Floral Foam degrades in 567 days in an anaerobic (landfill) environment. Use for Advent Wreath Making or for Holiday Wreaths. Display upright, hanging or flat for tribute wreaths, stage work, party work, holiday decor and more! It is no wonder OASIS Biodegradable Floral Foam is preferred by more Florists than any other brand! Oasis Wreath Bases consist of a ring of Oasis Floral Foam secured with clips to a sturdy green plastic base and incorporates Maxlife Flower Care Technology