I do have trigger point problems quite often. With this backnobber, I can find the locations of those trigger points much easier. I use this to apply deep heat to the affected areas. Very good and easy to use. I think it is made of kind of metal so it is very sturdy. I can apply quite some pressure on the affected areas with it without feeling damaging it. Very happy with it. Going to buy another one for my dad.
If you are new to interdental brushes and do not know what sizes are right for you, this pack is the right one to start with. It contains all 8 different sizes so you can try and find out what sizes you need to buy next time.