Quartet Dry Erase Sheets, 24-inch x 31 1/2-inch (85563) 40 foot roll contains 15 dry-erase sheets; perforated roll enables you to easily tear off in 31 1/2" increments creating 24" x 31 1/2" sheets Dry-erase sheets are made for presentations on the go: tear off, cling, write and toss away after a few days; writing with dry-erase marker allows quick changes with no mess; permanent marker can also be used to match your presentation need Sticks to almost any flat office surface and is designed for you to write on with dry-erase markers; static charge keeps each dry-erase sheet in place for up to 12 months despite gravity