The invention relates to a comb 100 for being attached to a hair-cutting device 115. The comb comprises two surfaces 103, 104 configured to be in contact with the skin 117 of the user. Each surface comprises a slot 105, 106 for attaching the comb to the hair-cutting device, and both surfaces have a common edge 107. When the hair-cutting device is attached to the slot of the first surface, the second surface is in contact with the skin, and when the hair-cutting device is attached to the slot of the second surface, the first surface is in contact with the skin. An asymmetric arrangement of the two slots allows for two cutting lengths of hair with one double-sided comb.
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