Access needle sets designed tofacilitate access into the renal pelvis for PCNL procedures. Mardis II Single Puncture Introducer Set featuers a 21 gauge needle with 10F tapered introducer assembly and includes 0.018 and 0.038 guidewires, and a 10F OD PTFE sheath designed for placement of up to three 0.038 guidewires. TLA Introducer Needle and Sheath Set featuers a 19 gauge needle with 5Fx20cm sheath, for placement of a 0.038 guidewire. Introducer Needle Set features a 18 gauge needle with 12cm or 20cm cannula for placement of a 0.038 guidewire. All are latex free.