EL450 Needle Electrode, Unipolar (Coated) EL451 Needle Electrode, Concentric Bipolar (Coated) EL452 Needle Electrode, Unipolar (Uncoated) ELSTM2 Needle Electrode, Unshielded, (BSL, for Stimulator) Same Day Shipping Orders with UPS Red or Blue shipping will be shipped on the same day (based on available stock) if received by 2 p.m. PT (Monday-Friday).