This is a case for a common disposable hand warmer. Disposable hand warmers can cause low-temperature burns, dry skin, and itching if the temperature is too high. I hope you can use it warmly and safely ^ ^ *I also use it myself (*´꒳`*) Size: Approximately 12cm (height) x 14.5cm (width) Shipping will be by standard or non-standard mail, so please allow some time for delivery. (No tracking or compensation) Can be changed to Rakuraku Mercari Mail Nekopos for an additional ¥150. Can be changed to Yu-Packet Post Mini for an additional ¥100. *If you request to combine with other items, please request at the original price. I will discount the shipping cost accordingly. ^ ^ If you have any questions, please comment.