• High quality aluminum foil bubble envelopes • Usable size: 3.5" x 5.9" (9 x 15 cm) • Overall size: 4.25" x 5.9" plus 1.5" flap (11*15cm plus 4cm flap) • This envelope is in good size for you to apply the shipping label • Water and tear resistant exterior • Self seal and super stick for quick packaging and worry-free shipping