The Chew Stixx Pencil Topper fits any number 2 pencil, decreases lead exposure, is safe for teeth, is socially acceptable, is allowed in classrooms, increases attention, lowers anxiety levels, and has been proven to improve concentration skills in children constantly seeking sensory input. Excellent for streamline and special needs children. Package includes one smooth and one knobby surfaced topper. Not for use with children under 3 years of age.