Really. Only 5 grams.
My scale is not hyper-sensitive; it only measures in whole grams. The yellow response rings, green perimeter rings, axle, and bearing did not register on the scale when those pieces were weighed without the body halves. Yes, they are that small and that lightweight. If my scale was more sensitive, they would likely add about a half gram more. So, technically the yo-yo weighs ~5 1/2 grams.
The 10.97 mm diameter was measured without the green rings installed. With the green rings installed, the diameter is 12 mm.
I was going to offer $5000 cash to anyone who could win 1st place in the 2A division at the 2021 World Yo-Yo Contest, using this “secret” prototype yo-yo. But, then I thought there’d probably be collusion between the player and the judges. So, decided against it. 
