size chart

diam3 (in cm) x 0.5236 x 2.65 = gram weight
gram weight div. by 452 = lb weight

one 2 inch C grade sphere = .38 lb x $45/lb = $17.10
one 3 inch A grade sphere = 1.35 lb x $90/lb = $121.50

diam (cm)

diam (inch)

weight (gram)

weight (lb)

5

2

174

.38

7.6

3

609

1.35

10.2

4

1472

3.36

12.7

5

2842

6.3

15.3

6

4970

11

17.8

7

7825

17.3

20.3

8

11607

25.7

22.8

9

16446

36.4

25.4

10

22380

49.5

28

11

30459

67.4

30.5

12

39368

87.1

33

13

49864

110.3

35.6

14

62603

138.5

38.1

15

76740

170