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2. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   Several companies such as Pentel, Pilot, and Uni-ball (Mitsubishi Pencil Co.) currently manufacture colored refill leads in a limited range of diameters (0.5 mm, 0.7 mm, or 2.0 mm) for their own products, as well as "variety packs" consisting of different colors of leads for those who want to trial different colors of lead. Koh-i-Noor makes ...

3. Colored pencil - Wikipedia

   en.wikipedia.org/wiki/Colored_pencil

   A variety of colored pencils. A colored pencil (American English), coloured pencil (Commonwealth English), [1] colour pencil (Indian English), map pencil, [2] pencil crayon, or coloured/colouring lead (Canadian English, Newfoundland English) is a type of pencil constructed of a narrow, pigmented core encased in a wooden cylindrical case.

4. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   This page was last edited on 16 November 2024, at 12:16 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

5. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   Lead for mechanical pencils Flexible pencils. Mechanical pencils use mechanical methods to push lead through a hole at the end. These can be divided into two groups: with propelling pencils an internal mechanism is employed to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is ...

6. Pentel - Wikipedia

   en.wikipedia.org/wiki/Pentel

   The first products for sale were released in 1951, followed by pencils in 1960. [ 2 ] In 1963 Pentel launched the "Sign Pen", a fibre-type pen that was used by then President of the United States Lyndon B. Johnson , who bought a dozen of them to sign photographs, apart from being adopted as the official writing instrument of NASA and going into ...

7. Shore durometer - Wikipedia

   en.wikipedia.org/wiki/Shore_durometer

   There are several scales of durometer, used for materials with different properties. The two most common scales, using slightly different measurement systems, are the ASTM D2240 type A and type D scales. The A scale is for softer ones, while the D scale is for harder ones. The image of Bareiss digital durometer is shown in the photo.