Er Ofset Matbaacılık is an İzmit-based printing business offering printed products and related services through its online shop. Its range includes wedding, engagement, henna-night, and circumcision invitations, with options across several styles and catalog collections. Customers can also find invitation envelopes, welcome boards, procession decorations, and labels for wedding favors. Many invitation designs are sold in packs of at least 100, with ordering quantities and prices specified by product.

The business also supplies stamps for individuals, professionals, companies, and organizations. Its selection includes automatic, pocket, pen-style, round, oval, date, numbering, and ready-made stamps, alongside stamp inks and replacement pads. Other products include business cards, oil cards, and car mats. The site highlights custom-designed invitation products as well as economical models, and lists brands such as Armoni, Cem, Erdem, İklim, Sümer, and Er Ofset Wedding. Er Ofset also promotes urgent stamp, invitation, flyer, and brochure printing; customers are asked to contact the business about these needs. Same-day dispatch is available for products with the express-shipping option.