Blank inside 5.5" x 5.5" Matte Cover White sealable envelope included for each card These high quality paper cards come pre-folded and includes a white envelope for each card. Works well with regular ballpoint pens after short drying time. www.kathrinlegg.com Instagram: https://www.instagram.com/kathrin_legg/ Facebook: https://www.facebook.com/Kathrin-Legg-Dear-Elise-1415386325362398/