These are Nyan-tomo Clean Toilet sheets. There are 2 unopened sets (12 sheets x 2) and 1 opened set (6 sheets remaining), for a total of 30 sheets. I am selling these because my cat's litter box has been replaced and they are no longer needed. I am also selling them on other platforms, so instant purchase is OK, but I will give priority to the first person to purchase, including on other platforms. Thank you for your understanding. I am also selling the chips. If you would like to purchase them together, I will give you a small discount, so please comment. Nyan-tomo Clean Toilet Deodorizing & Antibacterial Sheet Cat Toilet Sheet