LOKI Arthur China is a relatively new tacky rubber with a slightly more porous sponge than the usual Chinese rubber. Somewhat faster than e.g. DHS Hurricane 3 NEO. The sponge is about 40-41 deg hardness. Very good grip and spin ability and the control characteristics are really sharp for such a fast Chinese rubber.
Speed (LOKI): 11/13
Spin (LOKI): 12/13
Control (LOKI): 11/13
Reviews: https://revspin.net/rubber/loki-arthur-china.html
ITTF Info: https://equipments.ittf.com/#/equipment_preview/racket_coverings/3271