If these are anything like the other headphones I’ve disassembled there should be 3-6 screws hidden under the earpad foam. They will likely require a proprietary JBL bit. [https://www.amazon.co.uk/Magnetic-Triangle-Screwdriver-Strong-Magnetism/dp/B075NM4MFY/ref=pd_lpo_60_t_1/257-9561219-0386252?_encoding=UTF8&pd_rd_i=B075NM4MFY&pd_rd_r=66c48053-503d-4d05-bacd-e47cb9410533&pd_rd_w=TSulQ&pd_rd_wg=qknJR&pf_rd_p=7b8e3b03-1439-4489-abd4-4a138cf4eca6&pf_rd_r=T0FB7T3KGY0W60HBGXPJ&psc=1&refRID=T0FB7T3KGY0W60HBGXPJ|Here] is a link to some triangle bits, one of which should be the correct size for your headphones. Hope this helps!