Soft particles are composed of a solid substance, a compound metal, and a metal selected from the group of iron, copper, zinc and aluminum, in which the solid substance is suitable for use as a poison for harmful soft animals, It is characterized by the fact that a solid substance comprises different proportions of metallurgy within the solid substance. Claim 8: the particle referred to in claim 7, which is characterized by an outer surface composed of iron phosphate and ethylenediamine-N, N, N, n-tetraacetic anhydride (EDTA),The surface does not contain metallurgy； the core includes metal, does not contain iron phosphate and ethylenediamine-N, N, N, n-tetraacetic acid (EDTA). 109. Claim 12: a loose solid abrasive poison bait characterized in that it contains at least one abrasive particle in accordance with claims 1 to 11. Requirement 13:At least one particle is used according to any one of the requirements 1 to 11, which is characterized by being a soft decoy. 134. Claim 14: procedure for dealing with harmful molluscs, which is characterized in that a certain amount of bait is provided to harmful molluscs in accordance with claim 12.Partícula molusquicida formada por una materia sólida que comprende un compuesto, en donde dicho compuesto es metálico, que comprende un metal que se elige del grupo formado por hierro, cobre, zinc y aluminio, en donde dicha materia sólida es apta para servir como veneno por ingestión para moluscos dañinos, que se caracteriza porque la materia sólida comprende metaldehído en una proporción variable hacia el interior de dicha materia sólida. Reivindicación 8: Partícula de acuerdo a la reivindicación 7, caracterizada porque está formada por: la capa de superficie exterior que comprende fosfato de hierro y ácido etilendiamino-N,N,N,N-tetraacético (EDTA), en donde dicha capa de superficie exterior está exenta de metaldehído, y； el núcleo interno que comprende el metaldehído y está exento de fosfato de hierro y de ácido etilendiamino-N,N,N,
