BCW boxes are made of strong and durable cardboard, ensuring your cards are well protected whether you are using the boxes for storing cards or shipping. This box is our third smallest size box and is ideal for holding small collections or sets. It is also a very popular box for shipping card lots and at card shows.The boxes fit almost all popular Trading Cards including baseball cards, basketball cards, football cards, Magic The Gathering, Pokemon, Yugioh and others. Each box fits approximately 250 standard 20 pt. trading cards, or 400 Collectible gaming cards. The box fits cards in penny sleeves (but not toploaders). You can fit roughly 150 cards in penny sleeves.With their interior dimensions of 5 ⅛” x 2 ¾” x 3 ¾” inches, and exterior dimensions of 6 ⅛” x 3 x 4 ⅛” inches, they are also great for all small items such as collectible pins, game tokens, poker chips, jewelry, decks of cards, electronics, shot glasses, index cards etc. Unlike boxes from other brands, BCW boxes are designed so that the cover does not have to tuck into the box itself which can potentially damage the cards. Instead the cover tabs tuck into slots specially designed for them to fit in. (See images for design)These boxes weigh roughly two ounces, making them ideal for shipping as they are small and light, yet still well constructed and secure. Assembling the box is easy - you dont need tape or any other tools! Just a four step process and youve got yourself a reliable storage option or secure shipping box! (We do recommend taping the box when shipping).For additional organization, you can use the BCW horizontal dividers which are sold separately.So get the 6x3x4 Cardboard Shipping Mailer Box today to store and ship your cards, accessories, pins and more!