Abstract: A tool holder or writing instrument is provided which includes a formable modeling compound material positioned around a flexible rod or tube which in a preferred embodiment is capable of holding an ink or other writing substance. The material is capable of conforming to the fingers and grip orientation of a user of the writing instrument to provide a comfortable, ergonomically correct writing instrument. Additionally, a portion of this writing instrument (e.g., the flexible tube) may be wrapped around at least one digit of the user's writing hand, e.g. the index finger, to provide additional support and comfort. One end of the tube can include means for removably attaching various hand tools such as scribes, knives, electrical contacts or the like.