This Slimline Envelope die is part of the Essentials Collection from Pinkfresh Studio. This die is going to be a must have for all the slimline card lovers. This die will create an envelope for cards sized up to 4" x 9". The finished envelope will measure 4.25" x 9.25". This 2 piece thin metal die set is compatible with leading die cutting machines. This die is going to be a very worthwhile investment, whether you mail the cards or hand deliver them. You will be able to make envelopes out of not only solid papers, but patterned papers as well. A win/win for everyone!