The formula is secret -- the pencil is world-famous.Staedtler'™s success story began over 180 years ago, with manufacturing pencils. To this day, first-class materials and manufacturing processes guarantee outstanding and consistent product quality. Staedtler Ergosoft features its special, three-sided shape for easier grip and less fatigue while coloring, drawing and sketching for hours of absorbing creativity.All of Staedtler's pencils have super bonded cores that resist breaking while sharpening and drawing, both.Plus they wear more evenly. This pencil pack is not only an ideal creative companion for coloring drawing and art purposes, but everyone from pre-school age kids on up will benefit from the finest German manufacturing processes. Since 1835, Staedtler pencils have served both as tools and a source of inspiration for artists, graphic designers and illustrators.