They are well made but they are a little too big in diameter to fit in almost all my 18650 lights. The wrapping material is too thick compared to other protected 18650 batteries. What brand of light are you wanting to put them in?
I don't have any Sunwayman lights. The ones I have that the XTAR batteries won't fit are these-Thrunite Catapult V3, Lumintop TD15X, and Spark ST460NW. They will not even go in the hole. There is no problem with fitting in a Dereelight DBS or Solarforce L2P.