PSA means Pressure Sensitive Adhesive. They are self-adhesive sanding discs that immediately and easily connect to the sanding device. Accessible in both fabric backing or paper backing with fabric staying used for hefty responsibility grinding and paper becoming a more very affordable and light-weight selection for lighter sanding/finishing. Make sure https://www.facebook.com/permalink.php?story_fbid=pfbid0cBYku2ZfZsKExwQysMwxQWVLaaRzxn6KPz9DG8JCCiARFBfPQ8jcWQvzafLHRNEbl&id=61562415773754&__cft__[0]=AZUKzhYoPBYu64Arap6YU-1EI46p7zf3k7wgPFokdYD8_yypNsu3Q-if0gUjm5fTqbKRKbrZ0DPzi81dJnCtfoYj1YeG3b87rN_0sf5o2Uv2B7L4B58QiOKa31VTSZrlu3thAXA10m_Bd2hgpScXTk4bPC0ZSqrKO2asF_sJhTbKavJyLcszJL1hWdfejqyFlOcEKhyzOvSFGhOXXFo8Z57v&__tn__=%2CO%2CP-R