The product is a box of 100 Survivor QUAR4430 Tyvek Expansion Mailers by Quality Park. These mailers have a size of 10 x 13 x 2″ with an open side for easy access. They are made of 18 lb paper weight and are not custom bundled or modified items. These mailers are designed for secure and convenient shipping and packaging of documents or small items. Shipping is $10. If you have any questions please feel free to contact me.