The corner radius on our WePrint Sheetlabels depend on the size of that label that you choose. Some labels have corners that are sharper than others. If you need to know the exact corner radius of a certain sheet label, please reach out to us directly at 800-462-8379. 3x4 is 3/32" 3x5 is 3/32" 2x3 is 3/16"
For custom (rounded) square and rectangle shapes, the corner radius is a standard 0.125.