These eye-catching metallic silver bubble envelopes with internal dimensions of 230 x 230mm and external of 240 x 235mm have a glossy silver outer to ensure your mailer really stands out from the rest.  These bright metallic bubble envelopes are made from laminated aluminium, making them puncture and water resistant for enhanced protection and have a peel and seal adhesive strip to make a secure, tamper-proof closure to keep your items safe. Our metallic mailers offer a great value and simple solution for increasing response rates to direct mail and come with 100 bags per box.