New Delhi, 27 November (NNS): The sale of black pepper reported to be feeble due to the strong sale even after the winter season. Here, the prices of black pepper markara improved by Rs 20 to Rs 680 per kg because of the strong demand at the higher level. During the previous day, the prices have gone up by Rs 20/30 per kg. There was weekly holiday in Kochi and the arrivals reported to be negligible and the prices held stable at the same level. There is no fear of downtrend in the spot black pepper prices during the coming days.