<prompt> Harder stone with less satisfactory result in ESWL isOxalatePhosphateUrateCystine stones  <response>: Ans. d Cystine StonesRef Bailey and Love 27th Edition, Page 1408Extra Corporeal Shock Wave Lithotripsy: Shock waves generated and focused on the stones. Methods of Shock Wave Generation: Spark Gap Electromagnetic Piezo Electric Micro Expulsive Cardiac arrhythmias can happen in cases of Spark Gap generated waves ESWL is indicated for stones upto 1.5cm in kidney Prophylactic antibiotics are advised. Relatively resistant stone is CYSTINE due to its hardness. Contraindications: Pregnancy and Oral Anticoagulant drug consuming patients Steinstrasse - Stone street is collection of stone fragments in distal ureter after breaking by ESWL. 