It is both flexible and convenient.
Not flexible and heavy, not easy to use.
Cladding metal is similar to hollow metal, but plastic is not good, which is only useful in primary training.
It is most suitable for T-stick to hold thumb and middle finger at the same time.
Telescopic has its own advantages, but it can't replace ordinary ones.
There are detailed tutorials on attack methods on the Internet.
On the premise of keeping the best diameter and ensuring the reliability of strength, the larger the inner diameter, the better.
The requirements for selecting bars are similar.
The double T-shaped stick is practical and impractical, so it can't be put into use, and it is easy to injure yourself and your companions by mistake.