Beckman 326819 Polyallomer Centrifuge Tubes, 37 Tubes, 1/2 x 2 Inch. 

This listing is for 37 tubes, this listing is for 50. 

Please note: We stand behind the items we sell. We try to describe the items as best we can. If you feel we have not represented an item correctly, please contact us before leaving feedback, and we will try to resolve any problems. 

Ships free via first class mail. Additional shipping options available. 

Thanks for bidding :-)