Usable size of black bubble mailers: 4×7 inch, 50 pcs. It is ideal for packaging small business. Famagic bubble mailers are a reliable shipping solution, and provide more options to meet the diverse needs of customers. Our 4×8 inch bubble mailers are widely used in online business, since outstanding color and smooth touch of the padded envelopes could give a deep impression to customers. Bubble mailers could be applied to commercial and non-commercial use.