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5pc Equal Mass Density Set - Aluminum, Brass, Nylon, Acrylic & Polyvinyl Chloride (PVC) - for Specific Heat, Specific Gravity & Density Experimentation - Eisco Labs auspowers_batchone 1/2" ball transfer bearings5pc Equal Mass Density Set Aluminum, Brass, Nylon, Acrylic & Polyvinyl Chloride (PVC) for Specific Heat, Specific Gravity & Density Experimentation Eisco Labs Product Features 5 piece equal mass cylinder set. Set includes aluminum, brass, nylon, acrylic and polyvinyl chloride. The five cylinders in this set has an equal mass, measures 0. 5" (12. 5mm) in diameter, but varies in length from 0. 5" to 4" Excellent for physics classrooms. This set allows