These are 30 ultra-thin (0.9mm) sheets to prevent sweat stains! I'm selling these because the size didn't fit my clothes. This is a set of 40 sheets, and I used about 10, so I'm selling 30 sheets (new)! - Product Name: Sweat Stain/Dirt Prevention Sheet - Size: 23.5cm x 3.8cm - Thickness: 0.9 mm - Contents: 30 sheets ※ In some cases, the included instruction manual may be folded for shipping to reduce shipping costs. ※ Please be sure to check if it fits your clothes or hats before purchasing. Thank you for your understanding! Instant purchase OK! We will ship within 1-2 days. Thank you for reading to the end ☆ #AdhesiveSweatStainDirtPreventionSheet #SweatStainSheet #DirtPreventionSheet