High Density Smoothfoam 4" Diam. Ball - 4 Pack

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4" Diam. Ball - 4 Pack - Smoothfoam is made from EPS (expandable polystyrene). It can be manufactured in different densities. Our High Density Smoothfoam items are over 4 lb/ft3 de nsity and our Low Density is 1.25 lb/ft3 How is that figured out? If you had a 1 cubic foot of our low density product it would weigh 1.25 lbs and the high density would weigh 4 lbs. High density Smoothfoam items are more durable (less dents and blemishes), and have a better, smoother finish because of the smaller beads. Low Density items are softer. So better for hot wire cutting, projects that require sticking items (pencils, skewers, etc) into it. Show more