This is called the Unsquashable James Willstrop Hero squash racket, his new signature branding. View it here on Amazon.
Willstrop has been using the Unsquashable Y-Tec Pro racket
It seems to be the same specs just with updated graphics
Weight: 140 grams
String Pattern: 14 x 18
Head size: 500 sq cm
Also available on Amazon, click here, quite cheaply at the minute as the new racket is available imminently