Insulation bobbin and winding products

A winding product, comprising:

• a silicon steel plate, having a first end and a second end opposite each other;
• two insulation bobbins, respectively sleeved on the first end and the second end of the silicon steel plate, each of the insulation bobbins comprising:
• a winding portion, comprising:
• a body, having two first sides opposite each other and two second sides opposite each other;
• and
• two sidewalls, each of the sidewalls having a first bottom edge and a connecting edge and further having a first side edge and a second side edge opposite each other, wherein the sidewalls are respectively and perpendicularly connected to the first sides of the body, a length of the first side edge of each of the sidewalls is greater than a length of the second side edge, and the connecting edge of each of the sidewalls connects the first bottom edge with the second side edge;
• an outer stopper portion, connected to one of the second sides of the body and the first side edge of each of the sidewalls;
• and
• an inner stopper portion, connected to another one of the second sides of the body and the second side edge of each of the sidewalls, wherein the first bottom edge of each of the sidewalls and a second bottom edge of the inner stopper portion have a height difference therebetween;
• and
• a wire, wound from the winding portion of one of the insulation bobbins over the silicon steel plate to the winding portion of another one of the insulation bobbins.