https://www.amazon.com/gp/aw/d/B084P3WNK2/ref=psdcmw_9931389011_t1_B08BZJ9KRG and https://www.amazon.com/araree-Galaxy-Hybrid-Hinge-Protective/dp/B085Y52XP8/ref=mp_s_a_1_3?dchild=1&keywords=galaxy+z+flip+araree&qid=1625702468&sprefix=galaxy+z+flip+ar&sr=8-3 both don't use glue, the second protects the spine, but kinda a pain to put on take off. I switch phones often so I didn't like that one too much.