-High-quality pencil. -The 5 degrees make it ideal for school and office use. -Especially break-resistant thanks to super-bonded lead. -Easy to erase. -Easy to sharpen with any quality sharpener, e.g. our single-hole tub sharpener 511 004. -Available in 5 degrees.efficient for ecology - STAEDTLER® acts ecologically and efficiently at the same time!The pencils are unbelievably break-resistant through special lead formulation and super-bonded lead. This means that the high stability and strength of the leads enable longer writing with fewer interruptions.