False-colour scanning electron micrograph (SEM) of velcro. A common fastener, velcro is a nylon material manufactured in two separate pieces, one with a hooked surface (bottom) & the other with a smooth surface made up of loops (top). The loops are loosely woven strands in an otherwise tight weave. The hooks are woven into the fabric & then cut. When the two surfaces are brought together they form a strong bond. Magnification: x13 at 35mm size. Original is bw print H120/059.