A vibratory screen for high amplitude vibratory screening machines, comprising: a flexible molded polyurethane body having substantially parallel side edge portions (14, 16) at opposite ends of the body, a lower edge portion substantially perpendicular to the side edge portions (14, 16), an upper edge portion substantially perpendicular to the side edge portions (14, 16) and opposite the lower edge portion, an upper surface, a lower surface, first and second members (101, 102) forming screening openings, the first members extending between the side edge portions (14,16) and the second members extending between the lower edge portion and the upper edge portion, third and fourth members (203,204) having a thickness greater than the first and second members (101, 102), the third members substantially parallel and extending transversely between the side edge portions (14, 16) and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, first reinforcement members molded integrally with the third and fourth members (203,204), wherein the first reinforcement members have a circular cross section, and the first and second members (101, 102) are relatively thinner members (101, 102) than the third and fourth members (203, 204), thus providing a relative high amplitude of vibration of the vibratory screen, characterized in that the second members have a thickness greater than the first members. a flexible molded polyurethane body having substantially parallel side edge portions (14, 16) at opposite ends of the body, a lower edge portion substantially perpendicular to the side edge portions (14, 16), an upper edge portion substantially perpendicular to the side edge portions (14, 16) and opposite the lower edge portion, an upper surface, a lower surface, third and fourth members (203,204) having a thickness greater than the first and second members (101, 102), the third members substantially parallel and extending transversely between the side edge portions (14, 16) and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, first reinforcement members molded integrally with the third and fourth members (203,204), wherein the first reinforcement members have a circular cross section, and the first and second members (101, 102) are relatively thinner members (101, 102) than the third and fourth members (203, 204), thus providing a relative high amplitude of vibration of the vibratory screen, characterized in that the second members have a thickness greater than the first members. the first reinforcement members have a circular cross section, and the first and second members (101, 102) are relatively thinner members (101, 102) than the third and fourth members (203, 204), thus providing a relative high amplitude of vibration of the vibratory screen, characterized in that the second members have a thickness greater than the first members.