Nataraj 621 Classic Erasers are widespread & most affordable pencil erasers available in the market. The 621 Classic has been in the market since last 70 Years. It is designed for beginner to intermediate level students and experienced artists who require an easy-to use, quality product that can be used with all types of paper on different materials. 
It has a special formula which ensures residue sticks to the eraser and dont damage the paper or ink it is used on, resulting writing quality that will last for many years.
 A special eraser is needed to erase eratings of Black, Red, Blue, Violet colours without damage & erases the residue residue or the paper underneath them. Nataraj 621 Classic erasers are the best erasers that do what their name says they do.