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http://goo.gl/33smG6 add two normal size ( 4 & 6 mm diameter ) of straw, and one 3d printing spring.
Adjustable Volume Straw Pipette with 4/5/6 diameter size.
Order summary

Adjustable Volume Straw Pipette with 4/5/6 diameter size.
Color:
Quantity:
Subtotal
$
Delivery (May 04 - May 06)
Free
Total
$