The Sattler Grip is an innovation which gently guides the fingers into the ergonomically correct writing position. This product was developed by Dr. Johanna Barbara Sattler together with KUM® to provide an ideal writing aid for left- and right-handed persons. It's shape guides the fingers automatically and gently into an ergonomically correct writing position The Pressure Feedback System cushions the pressure and prevents the user from holding the writing instrument too tightly The pliable and pleasant feeling material is guaranteed free of toxic substances and eliminates the risk of allergic reaction Fits most pencils, pens and brush diameters Choice of 4 Colours .