The size of your rolls can be determined by measuring the width of the roll in mm and the diameter in mm of a complete roll. These numbers make up the reference. I.e a 5750 roll is 57mm wide and has a diameter of 50mm.
These rolls fit an extensive list of cash registers however some of the more popular machines are:
SEG1, SES10, SES100, SES400, SEC450, SES3000, SEC3500, SRS500, SRC550, SRS4000, SRC4500
XEA137, XEA177, XEA207, XEA217, XEA307
ECR7700, ECR7190, EXR7790
ER180, ER230, ER260, NR510, NR520, ER920/5