Die Cut usually means that the label is cut out with a cookie cutter to create the shape that you want the label to be. Die-cut may mean your label or tag will have rounded corners as opposed to square corners.
Custom Sizes are available.
Popular Sizes:
100X200mm
100X150mm
100X100mm
70X30mm
78X15mm
70X20mm
60X30mm
60X25mm
60X20mm
50X75mm
50X50mm
50X25mm
50X38mm
50X20mm