Do you need quick delivery of your letter or parcel Choose the striking Royal Mail Red First Class Stamps with a self adhesive backing to meet all your postal requirements. Business Sheet of 50 x 1st Class Large Letter Postage Stamps by the Royal Mail. A must have for large letter or parcel posting up to 353mmx250mm and weight of 100g. Always be prepared with this Business Sheet of 50 x Large Letter First Class Postage Stamps, ideal for the home, office or to ensure you always have a stamp available when you need one. Total of 50 Large Letter Stamps on a Business Sheet.