Our eye-catching metallic silver bubble envelopes with internal dimensions of 165 x 165mm and external of 175 x 175mm have a glossy silver outer to ensure your mailer really stands out from the rest. Our distinctive 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. These metallic mailers offer a low-cost solution for increasing direct mail response rates and have 100 bags per box.