It is.........an old pair of Radical Fish diabolos!
Pictured above are two white Radical Fish Diabolos.
Diabolo's diameter is 5 1/4 inches (135 mm).
Diabolo's height is 5 inches (125 mm).
Weight must be at least 345 grams.
The Radical Fish is a great diabolo for grind tricks. This diabolo's extra weight and metal 'throat' allows for easy controlled grinds on any stick.
This diabolo has more weight than most large (5 inch) diabolos. The added weight keeps the diabolo spinning longer.
Running two of these is a heavy experience. The control is quite amazing since the harder plastic and the extra mass allow for touch adjustments.
Newer Radical Fish diabolos are violet in color. Actually their production may have ended.