Our Pen Shell Heishi - Plain, 2-3 mm, is temporarily strung on strands that are are 24" long. Pen Shell Heishi is dark brown with a striped pattern. Other types and sizes of shell heishi are available, including 4-5 mm Pen Shell Heishi (24" strung). Graduated widths of Gold Lip Shell Heishi are NOT available, but this size is available in other types of shell. See related items below).