Erasers (commonly knowns a rubbers) come in all shapes, sizes and weights. Probably the smallest is the eraser that fits on the end of some makes of pencils.
0.4 pounds = 6.4 ounces
7 pounds and 12 ounces is 124 ounces.
12 pounds and 9 ounces is 201 ounces.
400 ounces is 25 pounds.
6,160 pounds = 98,560 ounces
19.3 ounces = 1.206 pounds
28 pounds is 448 ounces.
15 pounds is 240 ounces.
384 ounces is 24 pounds.
105 pounds is 1,680 ounces.
64 pounds is 1,024 ounces.
99.99 ounces is 6.25 pounds.