It is.........a bunch of blue diabolos!
Pictured above are some blue diabolos.
Forth row, left to right: (Performer, Giant);
Third row, left to right: (Renegade, MB Jumbo, II Jumbo);
Second row, left to right: (Henry Jazz. Henry Circus);
First row, left to right: (Henry Kolibri, Early Italian diabolo, MB Piccolino).
Each manufacturer has their own 'blue' .