67 mm, with a swirled grip – Deep spiral ridges round the whole ball for teeth and paws to catch on.
The shell comes off – The outer skin pulls away from a hard inner core, and replacement shells are sold on their own, so a chewed ball doesn't mean a new ball.
There's a button on it – This one isn't a plain rubber ball. We're waiting on the maker's spec sheet before we describe what it does — ask us and we'll tell you what the supplier says.
