Technical details:
Material: black, high density polyethylene
Bird ball diameter: 100mm (4")
Surface coverage: 116 black balls per square meter (10 per square foot)
Nominal weight: 40g (air filled)
Life expectancy: 10 years in conventional environments the black balls are 100mm diameter, UV stabilized, black hollow plastic balls, made of high density polyethylene. The balls float on the surface of a liquid, automatically arranging them into a close packed formation to completely cover the liquid surface
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