This is the Dunlop Hyperfibre+ Revelation JNR squash racket for juniors. It’s part of the Dunlop Hyperfibre range that’s come out for 2017/2018. The cosmetics on this are similar to the Dunlop Hyperfibre+ Revelation 125.
I’m not sure what length this racket is — junior squash rackets are often shorter than the standard adult length of 27 inches — but I’m guessing 25 inches, since that was the length of Dunlop’s previous Revelation Junior racket.
Update: this racket has been replaced by the Dunlop Sonic Core Revelation Junior