This is an eco-friendly eraser with a mix of biomass material derived from scallop shells and more than 10% weight ratio of the eraser.
It has the same erasing power as a traditional "mono" eraser, while reducing the amount of petroleum derived ingredients.

Product Features
Formulated with biomass ingredients such as scallop shell powder.
Scallop shell color is gentle
95% or higher than traditional mono eraser (according to JIS standard)
The erasing effect is smooth and easy to erase.
Slightly harder than the mono (PE series), and the eraser is low-key