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Calibrated loops 01850-00 and 01850-02 are ideal for Milk samples. The 1-microliter loops are made of 26-ga B&S Platinum wire with 15 percent iridium. The 10-microliter loops are calibrated and made of 19-ga B&S Platinum wire with 5 percent rhodium. Order insulated loop and needle holder separately. Platinum loops and needles are used for transferring bacterial cultures. These loops and needles are made of B&S Platinum wire with 15 percent iridium added for rigidity, permitting a thinner wire for delicate work. Loops are fused to form a "perfect circle" with an inside tolerance of +/-0.02 mm to ensure accurate delivery. Order insulated loop and needle holder separately.