In general, natural rubber or synthetic rubber eraser produced from, the KLF others, including color (white color pigment including zinc oxide, titanium oxide. Colours include iron oxide red, etc.) the indispensable is sulfur. There are also other ingredients, including oil, help rubber soft make forming simple help abrasion
The use of the eraser is? Eraser, pencil or remove imprint written into the material such as paper, the eraser to erase pencil eraser to friction with the meat pencil stuck on the paper. Make a pencil all removed, but in the case of a pen.