pears of the Williams or Rocha varieties, whole or in pieces, without peel, having undergone a heat treatment, packed in hermetically sealed containers with a covering liquid of sugar syrup or natural fruit juice and covered by CN codes ex 2008 40 51, ex 2008 40 59, 2008 40 71, ex 2008 40 79, ex 2008 40 91 and ex 2008 40 99