A body of a stud for a friction surface of a traction device, comprising: - a first head at one end of the body , the first head exhibiting a height in a first extending dimension (A) of the body , wherein the first extending dimension of the body is the main extending dimension in which the body has the largest extension and wherein the first head has a non-circular cross-sectional shape in a plane perpendicular to the first extending dimension (A), the lateral periphery (P) of the first head comprising at least one recessed portion which: o exhibits a reduced diameter compared to the maximum diameter of the first head , when measured from the center (O) of the first head , wherein the difference between the minimum diameter at the bottom of the recessed portion and maximum diameter outside the recessed portion defines the depth (D p ) of the recessed portion , o extends across the height of the first head in the first extending dimension (A) of the body , and which recessed portion o acts on the lateral periphery (P) of the first head over a lateral width (W), when viewed perpendicularly to the first extending dimension (A), and over a polar scope (S), when viewed along the first extending dimension (A), and - a second head at an opposing end of the body in the first extending dimension (A), characterized in that : - the polar scope (S) of the recessed portion is between 5 and 8 per cent of the circumference of the lateral periphery (P) of the first head , and in that - the depth (D p ) of the recessed portion is between 30 and 50 percent of the polar scope (S) of the recessed portion . - a first head at one end of the body , the first head exhibiting a height in a first extending dimension (A) of the body , wherein the first extending dimension of the body is the main extending dimension in which the body has the largest extension and wherein the first head has a non-circular cross-sectional shape in a plane perpendicular to the first extending dimension (A), the lateral periphery (P) of the first head comprising at least one recessed portion which: o exhibits a reduced diameter compared to the maximum diameter of the first head , when measured from the center (O) of the first head , wherein the difference between the minimum diameter at the bottom of the recessed portion and maximum diameter outside the recessed portion defines the depth (D p ) of the recessed portion , o extends across the height of the first head in the first extending dimension (A) of the body , and which recessed portion o acts on the lateral periphery (P) of the first head over a lateral width (W), when viewed perpendicularly to the first extending dimension (A), and over a polar scope (S), when viewed along the first extending dimension (A), and o exhibits a reduced diameter compared to the maximum diameter of the first head , when measured from the center (O) of the first head , wherein the difference between the minimum diameter at the bottom of the recessed portion and maximum diameter outside the recessed portion defines the depth (D p ) of the recessed portion , o extends across the height of the first head in the first extending dimension (A) of the body , and which recessed portion o acts on the lateral periphery (P) of the first head over a lateral width (W), when viewed perpendicularly to the first extending dimension (A), and over a polar scope (S), when viewed along the first extending dimension (A), and - a second head at an opposing end of the body in the first extending dimension (A), - the polar scope (S) of the recessed portion is between 5 and 8 per cent of the circumference of the lateral periphery (P) of the first head , and in that - the depth (D p ) of the recessed portion is between 30 and 50 percent of the polar scope (S) of the recessed portion . <EOS>