1. Prostate palpation: 1)  Normalprostate: chestnuts size, can touch sulcus of prostate; 2)  BPH: I degree of hyperplasia, egg size, shallow of sulcus of prostate; 3)  BPH: II degree of prostatic hyperplasia, duck egg size, absent of sulcus of prostate; 4)  BPH: III degree of prostatic hyperplasia, severe prostatic enlargement, regular surface and hard texture, goose’ egg size, cannot touch the bottom of the prostate; 2. Rectum palpation: 1)  Normal rectum 2)  Rectum polyps: Most is solitary, with peduncular polyp; 3)  Early rectum cancer: Palpable of tumor nodules on rectal wall surface, hard texture; 4)  Advanced rectum cancer: Little big tumor nodules are palpable on rectal wall surface, with uneven surface, hard texture, the late development stage of rectum cancer.

Basing on different degrees of prostate carcinoma, we design four interchangeable prostates: 1. Benign, slightly enlarged, but normal prostate gland simulates benign stage. 2. Prostate with two discreet, hard nodules (one is at left lobe; the other is at right lobe) simulate beginning stage. 3. Prostate with easily palpable large mass simulate intermediate stage. The small nodule has increased in size and has become an external hard mass on the surface of the gland. 4. Prostate with malignant invasive cancer simulate terminal stage. This gland is totally replaced with carcinoma. The entire gland will feel hard and irregular.