Mylar PACKAGE INCLUDES-- A total of 15 pieces of "Happy Birthday" letter balloons along with 1 straw and 1 ribbon. Each letter balloon measures approximately 16 inches. MATERIAL-- Crafted from high-quality aluminum foil, these balloons are made of environmentally friendly materials. They are safe and non-toxic, with self-sealing properties that allow the balloons to last for nearly a week without leaking or losing air. WIDELY APPLICATION-- Ideal for birthdays, birthday parties, weddings, baby showers, outdoor gatherings, home parties, celebrations, and other event decorations. SUITABLE FOR THE CROWD-- Perfect for adorning birthdays for babies, kids, and adults with this charming 'HAPPY BIRTHDAY' foil letter balloon banner. PERFECT PARTY DECORATION-- Hang these large foil happy birthday balloon banners in the kitchen, living room, or party space to show the birthday boy or girl how much you care!