writing instruments, namely, pens, pencils, and markers; lead pencils, crayons, pencil leads, lumber leads, pencil point protectors, pencil holders, pencil lengtheners, pencil cases, lead boxes, mechanical pencils, manually-operated pencil sharpeners, penholders, metallic pens, stylographic pens, fountain pens, rubber erasers, pencil boxes, school sets, pen and pencil clips, trays for lead pencils and penholders and easels for lead pencils and penholders, desk sets and desk stands