Soft, tissue-like puncture site skin insert fits into the body skin shell and allows for multiple biopsy procedure simulations to be performed. Five sets of replacement right & left posterior iliac crest bone inserts filled with simulated bone marrow. The inserts can be easily replaced to allow for multiple biopsy procedure simulations to be performed. One puncture site skin replacement and five pack of right & left posterior iliac crest bone inserts allow for approx. 180-200 accesses when following provided instructions. Replacement parts for Bonnie Bone Marrow Biopsy skills trainer.