Hyperboloid pen pencil holder

A perfect gift for any math teacher- the precisely oriented holes in this base direct 16 pencils to reveal a hyperboloid, the 3D surface traced by revolving a diagonal(skew) line, the outline of which is the conic section of the hyperbola. A doubly ruled surface for any desktop!

This stylish pen/pencil holder is a great way to store your writing utensils. New Sizes Available! We have 16 and 24, 25, 30 Pen / Pencil holders that accept any pen, pencil, hobby knife, or tool that is 8.5mm or smaller in diameter. Additionally, we have a 16 Marker holder that can hold Sharpie and similar diameter Permanent Markers that is 12mm or smaller in diameter.

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This product is 3D printed and made to order. Please allow 1-3 business days for printing time before shipment.

Pictures do not accurately reflect the size of this product! Please check the dimensions listed below to make sure that this product will fit.

*Pencils / Markers Not Included