High Density Smoothfoam 2 1/4" Diam. Ball 12-Pack

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2 1/4" Diam. Smoothfoam Ball 12-Pack - Good Alternative to Styrofoam ®. Smoothfoam is also know as EPS (expandable polystyrene) Smooth Styrofoam - Smoothfoam is made from EPS (exp andable polystyrene). It can be manufactured in different densities. Our High Density Smoothfoam items are over 4 lb/ft3 density 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