I bought this and didn't realize they have core sizes that make a difference. I have a primera lx810. Is there anyway for it to work? If not, do you have a 3" core for this size label?

The Primera LX810 requires a core size of 3". Below is a link to the RL2790GW which is a 1.5" circle on a 3" core. https://www.onlinelabels.com/RL2790GW.htm If you are not able to use the RL2789GW, you can return it for a refund by visiting the link below. https://www.onlinelabels.com/return.htm

i need a 1 1/2 in round plain white stickers in rolls...im confussed with the core size and all that ijust need 1 1/2 inch thats it

The core size is indicated since roll printers have specifications for core size. If you are not printing on these labels, then you would not need to worry about the core size. If you are using a printer, please refer to your printer's manual or specification sheet to see which core size is needed. If you are unable to locate this information, you can confirm your printer's make and model with our Customer Support Team by calling 888-575-2235. We will be happy to research this information for you.

Will these work in my epson tm-c7500g printer?

Our RL2789GW features 1.5" white gloss circle labels on a 2" core with a 5" outer diameter. We have not tested the Epson ColorWorks C7500G printer, so you'll want to review your printer's specifications to ensure this product is compatible.