Pack of 12 Dinosaur Costume Foam Masks - One Dozen Party Halloween Animal Print Birthday Party Supplies. 12 pieces Foam Dinosaur Mask. Made of durable foam, comfortable wear and can last long. One size fits all mask, great for kids and adults. Measures 7 x 5 inches each mask with assorted sleek dinosaur design and color. Dino mask are perfect for halloween costume party, birthday party, comic con and many more.