X-Large (extra-large) strips are shown to hold up to 20 pounds when used as four pairs (eight strips).
Listings show a maximum frame size of 24 × 36 inches for extra-large (X-Large) strips.
Common package counts shown include 4, 8, 16, and 20 strips.
They’re described to work on smooth surfaces including painted walls, finished wood, painted concrete cinder blocks, laminate, glass, metal, and tiles.
Clean the surface with rubbing alcohol before application. Use the strips indoors between 50°F and 105°F, and wait seven days after painting before applying.
Lightly hold the top of the strip and slowly pull it straight down toward the floor to remove it without damaging the surface.
X-Large strips are shown in white and black. A listed dimension for an X-Large strip is 4.37 inches long by 0.86 inches wide.
Review summaries report the strips are easy to use and generally hold wall hangings reliably.