Tennisball structure – rubber is inside to form the shape of the fabric outside.

So i wathed a video of american football cut in half. Rubber can be taken out of the fabric outside.

Football ball has same sturcture but made with thread instead of rubber.

If the ruubber cant stand fabric when i cut in half, i will use wire
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The ball i bought has rubber inside which cant form the shape by itself. I need a threaded one like the ball in the video but i dont have time to look for balls which have thread inside.
Furthermore, the wire doesn’t work as i expected. Maybe i can try a plaster bandage. However, i need a more efficient way to save time because i don’t have much time for it. I watched another video which cuts a basketball cut in half and it seems more solid than a football ball. however, basketball would be heavier than football ball so i need to consider the weight as the tutor has told me.
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i tried a quick experiment to see if this size of ball can show sufficient shape i want to make. The answer of the result was no. The ball is too small. The size of this ball is 5 so i would buy around 7.
+ i bought basketballs. However, the inside was made with rubber like the football ball. It is little bit harder than the rubber of the foot ball but it is still too soft. I searched and found the exact same product of the basketball in the video. it is quite pricey only for 3d experiment and it is an old product so i couldn’t buy it within few days. As i said i cant try all of balls in matter of time. i decided just using the balls i have bought to save times. i used clay all over the inside of the rubber.

after it was dried, it could form the shape itself. i tried quick experiment on my body like i did before, and its big enough to show the shape.