1/10 according to their site but a little tweaking is done.
Hobby King/Durafly just sent me a pre-production kit of their new 1100mm P-40 that will be released very soon! I have just added a dozen new P-40 schemes for it! The Durafly P-40 is very close to 1/10th scale. When ordering, select the 1/10th scale option and then put a note on the order page that it's for the Durafly kit and I'll be sure to scale it to your models exact dimensions.