I've been initially looking for 1/2 inch label cartridges for my labeler (Brother PT-1950 P-touch PC-Ready Labeler for Small Workgroups) which was the standard cartridge for the labeler.  During my search, I found the 3/4 inch label cartridge and decided to give it a shot.  You can get some really LARGE labels out of the 3/4 inch labels.  Highly recommend to anyone with using any labelers out there.