Sponge ball type / name: 28 - P 150 - 3 or equivalent -Ball diameter: Ø = 28 mm (deviation from sphericity of 0.3 mm in diameter) -Type: P 150 -Hardness class: 3 -Material: spongy rubber, expanded elastomer -Spongy ball color: dark brown -Appear density: 0.35 ÷ 0.45 g / cm3
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