This category captures miscellaneous processing residues that don't qualify as noils (too irregular or not from combing) and haven't been garnetted. Examples include burr waste from carbonizing, slipe wool pulled from hides, and floor sweepings from wool-processing mills. These materials are generally lower in value and used in agricultural, horticultural, or industrial applications rather than textile spinning.

Horsehair waste is classified under a separate heading specific to horsehair, reflecting its distinct fiber characteristics and end-use markets (brush manufacturing, upholstery, musical instruments). The explicit exclusion prevents misclassification of horsehair processing residues into the general wool/animal hair waste category, which would affect duty treatment.