A mouse structure, comprising: a casing having a recess; and an assembly assembled to the casing so as to be received within the recess of the casing, the mouse structure further characterised in that: the assembly has a first surface forming the top of the assembly, a side surface and a second surface opposite to the first surface forming the bottom of the assembly, wherein the side surface joins the first surface and the second surface forming the edge of the assembly; and wherein the mouse structure further comprises: a piece of leather having a first portion and a second portion; wherein the first portion of the piece of leather covers the first surface and the second portion covers the side surface and part of the second surface; and wherein the assembly is engaged to the casing through a locking member, so that the second surface faces the casing and both the side surface and the second surface are located inside the recess of the casing, and the casing presses against part of the second portion of the piece of leather that covers the side surface and part of the second surface. a casing having a recess; and an assembly assembled to the casing so as to be received within the recess of the casing, the mouse structure further characterised in that: the assembly has a first surface forming the top of the assembly, a side surface and a second surface opposite to the first surface forming the bottom of the assembly, wherein the side surface joins the first surface and the second surface forming the edge of the assembly; and wherein the mouse structure further comprises: a piece of leather having a first portion and a second portion; wherein the first portion of the piece of leather covers the first surface and the second portion covers the side surface and part of the second surface; and wherein the assembly is engaged to the casing through a locking member, so that the second surface faces the casing and both the side surface and the second surface are located inside the recess of the casing, and the casing presses against part of the second portion of the piece of leather that covers the side surface and part of the second surface. the assembly has a first surface forming the top of the assembly, a side surface and a second surface opposite to the first surface forming the bottom of the assembly, wherein the side surface joins the first surface and the second surface forming the edge of the assembly; and wherein the mouse structure further comprises: a piece of leather having a first portion and a second portion; wherein the first portion of the piece of leather covers the first surface and the second portion covers the side surface and part of the second surface; and wherein the assembly is engaged to the casing through a locking member, so that the second surface faces the casing and both the side surface and the second surface are located inside the recess of the casing, and the casing presses against part of the second portion of the piece of leather that covers the side surface and part of the second surface. a piece of leather having a first portion and a second portion; wherein the first portion of the piece of leather covers the first surface and the second portion covers the side surface and part of the second surface; and wherein the assembly is engaged to the casing through a locking member, so that the second surface faces the casing and both the side surface and the second surface are located inside the recess of the casing, and the casing presses against part of the second portion of the piece of leather that covers the side surface and part of the second surface.