The Poppy Stamps Large Stitched Envelope and Postage Dies are a set of crafting dies made from durable steel, designed to be compatible with almost all die-cutting machines available. These versatile dies can be used on various materials such as cardstock, felt, fabric, and shrink plastic, enabling you to cut, stencil, emboss, and create a wide range of projects. The set includes 2 dies that cut out 3 different designs. The dimensions are approximately 4.9 x 4.3 inches for the envelope and 0.6 x 0.8 inches, and 1.1 x 0.7 inches for the postage dies. With these dies, you can easily create your own envelope complete with faux stitching, adding a charming handmade touch to your projects. Additionally, you have the option to customize the postage dies by adding stamp designs, allowing you to create more personalized and unique cards.