Scotch SJ3560 Dual Lock 250 Reclosable Fastener 1″ x 10 ft 3M SJ3560/CLR1333
Type 250 stem density fasteners can mate to type 170, 250 or 400 fasteners (the higher the combined number the greater the closure strength). Mushroom-shaped stems on one side of the fastener interlock with identically shaped stems on the other side for 5X greater closure strength than hook and loop.