R E C T A N G L E   L A B E L S Tri-Flex offers rectangle and square labels available in any material in a multitude of sizes from 3" x 6 3/8" to 6" x 8". Rectangle Labels feature 90° corners, rather than rounded corners. We'll be happy to provide any custom size you may need...simply contact us with your size and Tri-Flex will find a solution for you.