Pencils + Pens

Pencil "lead," actually made of graphite, is an allotrope of Carbon.
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      Girls in STEM Pencil Pack
      $8.75
      layers of the atmosphere imprinted on blue pencils
      Atmosphere Pencils
      $7.75
      Smarty Pants Pencils
      $7.75
      Biomes Pencil Set
      $7.75
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      Solar System Pencil Box
      $12.00