Images of the Harris Tweed industry, in the form of photographic slides (also known as diapositives) - slides are specially mounted individual transparencies, intended for projection, usually in 35mm size. These would have been taken using colour reversal film (the number code and/or words on the edge can be used to work out what specific brand of film was used, but usually this is not visible).
The main subjects covered are fashion and landscape. No dates are present, but from the content and style of the images, it is presumed the majority were captured in the 1980s and 1990s. Most are of unknown copyright.