Shield Question

I see some people's shields last a very long time before breaking compared to my shields where they break pretty quickly. So my question is how do you increase the ability of your shield to absorb more damage before it breaks besides unbreakable tune up

well i dont really know but can you explain to me how can i get shields? maybe then i can figure out how to make its life span longer in battle

Well I'm not sure you can use an unbreakable tune up for shields. I believe those only apply to arms and head parts. I think those peoples' shields are either just a better kind than yours, or you just underestimate how much damage you're taking and how much they take.