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This is an environmental friendly product. First we use the empty bottle to collect waste , they we put a pencil-sharpener in the lid. This is how our Bottle Sharpener was made. You can put the pencil in the lid and sharp. The advantage of this sharpener has three : Reuse the empty bottle , decrease the pressure of environment ; Then you can hold the bottle to sharpen the pencil, it can save force ; The waste can be collect in the bottle, easy to clean.
The video is on http://www.youtube.com/watch?v=EZtEx7Guil8
School of design