Twill material is the same type of material that the Greek letters are made from. Twill letters are $2.50 per letter per color. Letters will always come Uppercase. PLEASE specify what is being written in the box above - 12 character limit per line. Please adjust quantity accordingly so that it does not hold up your order. Selecting this feature will add 2-3 business days to the production time of your order. If you have any questions, please contact Customer Service.