Alvin 18x24 vinyl sheet protector envelope Heavyweight .010" thick vinyl and waterproof zip top closure protects valuable documents from dirt, dust, and moisture. Heat-sealed edges with zip-locking top. Reinforced holes on both long sides for hanging. Great for commercial or marine applications. Notations can be made on the vinyl blueprint protector by using a grease pencil or water-based felt pen. Print protector wipes clean with either a dry cloth or soap and water. Perfect document protector for business, contractors, architects, sports, pilots, surveyors, engineers, builders, navigators, artists. CONTENT SIZE: 18x24. PACKAGE OF 1 SHEET PROTECTOR. Alvin ACP24 clear vinyl sheet protectors are made in the USA.