There are SO MANY kinds of 'plastic' that's an impossible question.
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Of course, different brasses and forms can vary, but at a specific gravity of about 8.5, a cubic inch of brass would weigh about 5 ounces (or just under a third of a pound).
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
lead density is 0.41 pounds/cubic inch 1.68 x 0.41 = 0.688 pounds
Well, honey, a cubic inch of plutonium weighs about 0.33 pounds. Just remember, you don't want to go tossing that stuff around like it's a hot potato at a family barbecue. Keep it safe and secure, unless you want to glow in the dark like a disco ball.
1 yard of 1" crushed stone