Schacht has built a lifetime of service into their hand cards. They have a small lip molded into the rear edge of the paddle to protect the carding cloth from becoming worn and the handles have been precisely tenoned into the paddles for superior strength.
Cotton cards are available with 208 psi (Point per Square Inch), which is great for cotton and other short and/or exotic fibers. These are also available with flat or curved-backed paddles.