CleverDelights 4” x 6” blue plastic cards. 100 pack. These waterproof cards are great for indoor or outdoor use, including wet and damp environments. The 4x6 inch cards are a more durable alternative to paper index cards that can easily tear and are not weatherproof. Made from tough, 10 mil thick plastic stock, these cards can be used in many applications ranging from durable price tags, inventory classification, equipment identification, flash cards, and more! Easily add a hole to these tags by using a standard paper hole punch, converting these cards into heavy-duty price tags, or to help attach these cards to machinery and gear. For best results, use permanent markers with these cards. Not recommended for use with printers. Please visit our store for our full selection of CleverDelights plastic cards and plastic tags, in various shapes and colors. Thanks for shopping with us!