The answer will depend on what the tube is made from and how thick its walls are.
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weight of ms hollow bar 20mm*20mm
The Indian Head cent's composition is: 0.88 copper & 0.120 nickel; diameter is 19mm; and weight is 4.67 grams.=The Lincoln cent's composition is: 0.95 copper, 0.050 tin & zinc; diameter is: 19mm; weight is: 3.11 grams.=
(Side1Xside2) x ((side1-2t)x(side2-27))*0.007850 where all dimensions are in mm & the weight is Kgs/Mtr
19mm is more precise. 19mm = 1.9cm
1.9 cm