Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed with sharpening

I thought I had discovered the perfect combination of triangular pencil without the too-large size of the Tri-Conderoga, but then the Tri-Write proved to be very difficult to sharpen in my mechanical pencil sharpener. The pencil leads kept breaking despite my taking every care. I'm going to stick with the basic black hexagonal model and maybe try the Mirado Black Warrior.