The Pro-Biotic range takes a new turn. While retaining its nutritional quality and carefully selected ingredients such as yeast, betaines, liver, salt and oils, Pro-Monster also contains fish and a number of highly effective crab derivatives. This powerful-scented bait offers fish a highly nutritional food source. Carp love it. Pro-Monster crab is effective both over the long term and instantly. During the test phase, which took place in a number of countries, Pro-Monster crab proved highly effective in catching large fish. When crushed in a PVA bag, the Pro-Monster crab proved irresistible. This intensifies its attraction and attracts many carp. An ultra-attractive bait.