KKBESTPACK 100 Pcs 12×15.5 Poly Mailer Envelopes 12″ X 15.5″ BLACK is a rectangular-shaped self-seal envelope made of polyethylene material. The product dimensions are 15.5 x 12 x 0.1 inches, and it weighs 2.64 pounds. The envelope is suitable for packing and shipping, and the brand is KKBESTPACK. The closure type is self-seal, and the material type is polyethylene (PE). The item model number is B125, and the manufacturer part number is also B125. The package includes 100 envelopes.