Our metallic silver bubble envelopes with internal dimensions of 140 x 165mm and external of 155 x 170mm are the smallest in our range and are designed to stand out from the rest with their eye-catching, glossy outer. These striking metallic silver bubble envelopes are water and puncture resistant as they’re produced from laminated aluminium, and the peel and seal closure makes a strong tamper-proof seal to keep items safe and secure. These great value metallic silver mailers are the perfect way to increase direct mail response rates and come with 100 bags per box.