New Delhi, 11 July (NNS): Here, the prices of black pepper markara improved by Rs 10 to Rs 545 per kg owing to the increased offtake even after the higher prices. Before this, the prices have gone up by Rs 10/15 per kg. The arrivals reported to be negligible on Kochi and the prices held stable at the level of the previous day. The spot black pepper prices likely to remain strong during the coming one or two days.