We do offer a 4" x 6" thermal label on a 3" core. Below is a direct link to our RL786 for your review. This is available in both thermal transfer and direct thermal material options. https://www.onlinelabels.com/products/rl786 If you’re unable to use the RL2792XW you can initiate a return at the following link. We’ll be happy to offer a full refund for any unused sheets returned within 60 days of the purchase. https://www.onlinelabels.com/return.htm