Factis high quality erasers are manufactured by a Spanish company who have been producing high quality erasers from harmless materials for almost a century.
The Factis S20 is made of synthetic rubber with a great adsorption power and can be used for any kind of pencil graduation. This erasers work perfectly on any kind of paper and all surfaces. Hardness 42 degrees shore A
The Softer S20 is ergonomically designed, it also lift traces of charcoal, paste and pastels.