Size indicates foot print not thickness. Best used as replacement bulkhead foot brace foam outfitting or as alternative outfitting for late model Wave Sport brand white water kayaks with the larger foot brace. Instructions are not included. WAVEOUT
Velcro self-adhesive pieces (top row outer in photo) are 8 inches long.
Wedge foam blocks (top row outer in photo) are 10 inches long.
Thin self-adhesive foam (bottom row in photo) are 13 inches long.