The RL2799XW has a 2" core so it would be recommended for Primera LX400 or LX500. You can see the compatible printers listed on the product page on the left side below the product image and Product Specs. I have included a link below for our 3" x 2" label, 3" core, for use with a Primera LX2000. https://www.onlinelabels.com/products/rl2800xw