These I-bar sealers have seal widths of either round wire or 2.7mm. The round cut-n-seal wire unit is usually needed for cutting and sealing shrink wrap materials. We also carry I-bar impulse sealers with cutters and a 2.7mm wire that have a cutting blade to trim the excess end of a bag off or for using tube stock. The AIE Portable I-Bars have a round wire and a seal bar that can be used detached from the machine.