Size: 4" x 4"Shipping labels are essential for packages that contain dangerous goods. Our shipping labels  are designed to meet and comply with D.O.T. regulations and ensure clear identification of hazardous contents.D.O.T. shipping labels are printed with fade resistant inks and are available in two materials, paper for indoor applications and vinyl for extended outdoor usage.Our shipping labels are manufactured to meet  specifications under Title 49, Subtitle B, Chapter I, Subchapter C, Part 172 of the CFR.