Kokutan GS was sold at events in Singapore , but not at any other shops.It is grey squirrel mixed with synthetic. The hair shape is similar to that of B004. The last picture shows Kokutan eyeshadows relative to B004. From the top, Kokutan eyeshadow SG (goat/synthetic)Kokutan SC (tamage)B004G (goat)Kokutan eyeshadow GS