Renal Biopsy Model Replacement Kidneys Inserts (2) Include Renal Capsule, Renal Parenchyma, Renal Cortex, and Renal Pelvis used with Model BPP-086 or BPP-087 (Comes with two kidneys). Blue Phantom products are not returnable. This does not effect exchanges due to defects to the product. Product is covered under 1-year warranty.