VANVENE 50pcs/lot 18" Colorful Happy Birthday Helium Foil Balloons,Letter Ballon Party Decoration Aluminum Foil Membrane Ballons Package :50PCS(Blending, such as pictures),you will get 4-9 styles happy birthday balloons. Size:18inch 1cm=0.3937inch This balloons is self sealing so no tying with fingers required. Material is aluminum film, color uniform, spherical beautiful This beautiful balloons is great for children's birthdays, parties!