You will probably get better info posting in the anabolics section.
Have you used PH's before? This is (Ultradrol)Methylstanbolone and DMZ, which are methylated compounds. Not too familiar with Ultradrol, but I know DMZ is great for hardness and lean gains with minimal water retention. I'm sure others will be of more help with stacking the two products, but I would run one or the other solo if you don't have PH experience. The side effects can be strong with either product.
With any methylated compound, I would recommend a full on cycle support, and certainly a SERM PCT followed by a natural test booster. What is your experience with PH cycles?