Ɛmena ne Kɔkɔsɛsɛ are two separate items. 
The former came first and it is made out of elephant tail and the latter is from ostrich feathers. 
The ostrich is commonly known as sohori but the formal Twi name is kɔkɔsɛsɛ. 
It was not uncommon in the past for bugs (including bees, flies, etc.) 
to crawl or fly around the king during ceremonies and as a result, 
Asantehene Kusi Boadum (c 1750-1764) created these regalia items, 
ɛmena ne kɔkɔsɛsɛ for his grandchildren (and now, great great grandchildren) to whisk bugs away from him