So I use this art eraser very happy. Especially for etchings in a drawing as a stylistic device, to lighten, blur etc very suitable. If someone wants to "just clean" erase there are certainly cheaper and simpler solutions.
Gripe here: THE PRICE! - Why only 2 stars!
I buy my erasers from Faber Castell for just 0.90 (exactly this SKU FC), so keep your eyes!