Notes tennis ball pressure vessel

Please use, but be careful of the following points.

●High temperature Note
　　Heat is 60 degrees because it is plastic.
　　Do not leave the device in the car, etc., especially in summer.

●Impact Note
　　Since it has been bonded together with superglue, please note the shock.
　　It is okay to the extent that you have dropped a little, but ...





●Please do not raise the pressure more than necessary! ! !
　　Breakdown voltage has been confirmed until about 2 atm,
　　 but please do not raise the pressure unnecessarily.

　　By the way, it looks like the picture below If you increase the pressure unnecessarily.
　　Of course, very bad ... to the ball
make11 make12
*** 1 crushed the ball: Video(youtube) ***
*** 2 crushed the ball: Video(youtube) ***



＜＜＜Little calculation, knowledge＜＜＜　　 ＞＞＞During fabrication＞＞＞



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