Reforming Yo-Yo / The product design

A combination of Top and Yo-Yo,with one fitting added to each side,ties in with one special reforming line.You can play it as a common Yo-Yo,as well as a Top.When you serve it in horizontal direction,the Yo-Yo can shuffle off the line,falling down to the ground,spinning as a Top.
The line:It is so similar to the line of common Yo-Yo,just in little differences at the lower extreme of the line.At that part,the line is slack in normal state instead of twining tightly.It can be stretched to be an ellipse big enough for Yo-Yo to fall off.