New Delhi, 13 February (NNS): The prices of black pepper held firm at Rs 635 per kg owing to the sluggish sale even after the feeble prices. Recently, the prices have gone down by Rs 10 per kg. The arrivals reported to be negligible and the prices remained stable at the same level of the previous day in Kochi. The spot black pepper prices will likely to remain sluggish during the coming days.