What is the structure seen in the given X-ray below?

Plain abdominal X ray showing a stent in the right and left ureter. Ureteric stents,also known as double J stents or retrograde ureteric stents, is a urological catheter that has two "J-shaped" (curled) ends, where one is anchored in the renal pelvis and the other inside the bladder. Stents are used for the free passage of urine from the kidney to the bladder, in adverse conditions such as postoperative urologic procedures, and previously to lithotripsy and ureteral obstructions. Indications Stents may be uses for a sho of long term period depending on the indication: * obstruction from urolithiasis * malignant obstruction (typically pelvic malignancies) * benign strictures * retroperitoneal fibrosis REF : DAVID SUTTON 9TH ED: