These high quality birthday party invitations are printed on heavyweight matte card stock paper and have mailing envelopes made out of superior paper.The invitations are post card style (non-folding) and come in a white, black and gold design that your guests will absolutely love.There are 30 cards in total with 30 accompanying white envelopes all measuring 5*18cm (A7 format).The invitations are single-sided and can be written on in either pencil or pen without smearing.They can be used for any fifty year old's birthday party, man or woman.Not only do they come in rich vibrant colours but they are thick, making them more durable! Copyrighted design registered by Papery Pop.