Free custom imprinting is available on hearing aid battery orders of 10 cartons or more. You can have up to 4 lines of text, with 20 characters in each line. We can also print your logo if you e-mail us a copy in a pdf, tiff, or jpg format.  Batteries are available in either cards of 4 cells or cards of 6 cells, 10 cards to a carton.  For more information call us at 1-800-OK-HOCKS (1-800-654-6257), or e-mail Kari or Karen at customerservice@hocksproducts.com.