The modular group for forming compact products, comprising: a plurality of concave matrices, each destined to contain and give shape to a product a maximum dimension of which does not exceed three times an intermediate dimension thereof, having concavities facing upwards, the matrices being manufactured singly and being solidly joined to one another, arranged in a longitudinal, straight, horizontal alignment; a pair of heads, substantially vertical and perpendicular to the longitudinal alignment of the matrices, parallel to one another, arranged at two ends of the alignment itself and externally thereof, each head comprising at least a hooking means suitable for constraining the head to a corresponding head belonging to an identical and underlying modular group, such as to prevent reciprocal distancing of the heads in a vertical direction, a plurality of covers destined to close mouths of the matrices, arranged aligned to one another in a straight, horizontal and longitudinal alignment, means (15, 16, 17) for constraining the matrices and/or the heads to one another to form a monolithic group, and means (21, 33) destined to constrain the covers to one another and the covers to the monolithic group formed by the matrices and the heads, the groups being stably stackable on one another, in vertical columns and in horizontal rows, characterised in that it comprises a horizontal longitudinal crossbar, ends of which extend from a head to another, which crossbar supports the covers, in which the crossbar is constrained to the heads and is able to make limited vertical displacements with respect to the heads, elastic means being comprised to push the covers downwards with respect to the matrices. a plurality of concave matrices, each destined to contain and give shape to a product a maximum dimension of which does not exceed three times an intermediate dimension thereof, having concavities facing upwards, the matrices being manufactured singly and being solidly joined to one another, arranged in a longitudinal, straight, horizontal alignment; a pair of heads, substantially vertical and perpendicular to the longitudinal alignment of the matrices, parallel to one another, arranged at two ends of the alignment itself and externally thereof, each head comprising at least a hooking means suitable for constraining the head to a corresponding head belonging to an identical and underlying modular group, such as to prevent reciprocal distancing of the heads in a vertical direction, a plurality of covers destined to close mouths of the matrices, arranged aligned to one another in a straight, horizontal and longitudinal alignment, means (15, 16, 17) for constraining the matrices and/or the heads to one another to form a monolithic group, and means (21, 33) destined to constrain the covers to one another and the covers to the monolithic group formed by the matrices and the heads, the groups being stably stackable on one another, in vertical columns and in horizontal rows, characterised in that it comprises a horizontal longitudinal crossbar, ends of which extend from a head to another, which crossbar supports the covers, in which the crossbar is constrained to the heads and is able to make limited vertical displacements with respect to the heads, elastic means being comprised to push the covers downwards with respect to the matrices.