Tailor's Ham is use for pressing curves, Sleeve Cap, Opening seams and lots more. It's a must have for all Fashion Designers, it's comes in two sided. The Plain white side and the Pattern Size. The Plain white side is use to press high temperature fabric, Example are Cotton, Lining etc. The pattern side is use to press cotton of low temperature, Example Polyester materials If you don't have a Tailor's ham, if you Press your fabric it's going to look very flat, but with tailor ham you get a curvy