What are those small black pellets in the athletic field at Pier 25? They’re kind of the size of Grape-Nuts cereal, or maybe Pop Rocks. —U.

“Those pebbles are actually rubber infill and are standard for synthetic turf fields,” emailed David Katz, Vice President, Marketing & Events at Hudson River Park Trust. “You’ll find them on the other turf fields in the park as well (Pier 40, Pier 46, Chelsea Waterside Park).  The infill cushions the surface providing shock absorbency and turf stabilization.”

Got a question? Email tribecacitizen@gmail.com.

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