That depends on the substance from which it is fabricated.
A concrete block is heavier than a styrofoam or tofu block with the same dimensions.
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You need 8 cubic blocks of sides 0.5 inches to make a 1 inch block.
The 77 has better metallurgy. Any advantages of the 68 318 are not specific to the block.
4
Two measurements are indication of area. The area would be 144 square inches.
47 pounds if there wet.