Students can practice math problems, letters, writing skills and more with these 12 x 9 pockets that are open on the long side. Saves paper, time and money by eliminating copying worksheets over and over. Reusable super heavyweight pocket lasts a long time. Convenient eyelet for hanging. Cleans easily with a soft dry cloth or tissue when used with a low-odor dry erase marker or dry erase crayon (not included). Black. Insert Size: 9 x 12 or smaller sized papers. Pack of 10.