3M Dual Lock, Black, 1" wide, 400 stems/inch, sold in 1 foot lengths
Great for securing items in the cockpit. Works well with 250 stems/inch Dual Lock. It does not work as well with itself. It offers better high temperature performance than the low-profile option above and also offers higher holding strength. Bonds well to metals (aluminum, stainless steel), glass, plastics (acrylic, polycarbonate, ABS) and paints.

Bonding Strength Comparison
(lowest on the left, highest on the right) 
Low Profile/Low Profile < 250/250 < 250/400

Color of interlocking part: Black
Color of adhesive: White
Width: 1 inch
Total Engaged Thickness: 0.23 inches (5.7 mm)
Adhesive: General Purpose Acrylic
Stem Density: 400 stems/inch
Temperature resistance: 200° F (93° C)
Works well 400 stems/inch, *** Does not work well with itself *** 
Sold by the foot - one side only (ordering 1 foot gets you 6 inches of both sides)

See option below for ordering a pair with one side having 250 stems/inch and the other side having 400 stems/inch. That is the option with the strongest holding strength.