https://www.amazon.com/Cell4less-Multipurpose-Industrial-Transparent-1PK-15ML/dp/B085P45FZQ/ref=mp_s_a_1_3?dchild=1&keywords=b7000+glue&qid=1630011048&sprefix=b7000+&sr=8-3
Its the glue to glue back the back screen.