Soragoi are Grey/Silver, solid coloured Koi Carp, with strong scale reticulation (known as fukurin) giving them a net-like pattern.  Introducing a Soragoi to a pond full of nervous Koi has a calming effect, speeding up the hand-feeding training process.
 
*Actual koi shipped may vary slightly, however it will be a 5-8" Soragoi