My thanks to Kent from PenciLog for sending me a MonAmi Gripix eraser and a HwaRang Dust-free eraser.
MonAmi is Korea’s largest stationer, and Gripix is one of their brands associated with mechanical pencils, leads, and erasers.
HwaRang is a long established rubber company.
I believe both firms do have some products for sale in North America, though they are not prominent in the stationery market.
Both erasers work well, but Kent reminds me that they contain phthalates, so they are probably not the best choice for children.