Thank you for viewing. I purchased this in Korea. Hwangto (Yellow Earth) Chimsil Pack 20 x 26 cm Also known as a hot pack in Korea. Made in Korea. Microwave for about 2 minutes. Can also be used cold. Recommended for those who enjoy mugwort steaming or brown rice warmers. Size is slightly smaller than A4 size. Gently warms and soothes the lower abdomen during menstrual pain, and the lower back for back pain. No smokers, no pets. I try to ship quickly. Please feel free to ask any questions. Thank you.