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 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, the lateral periphery 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 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 of the body, and which recessed portion o acts on the lateral periphery of the first head over a lateral width, when viewed perpendicularly to the first extending dimension, and over a polar scope, when viewed along the first extending dimension, and - a second head at an opposing end of the body in the first extending dimension, characterized in that: - the polar scope of the recessed portion is between 5 and 8 per cent of the circumference of the lateral periphery 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 of the recessed portion. - a first head at one end of the body, the first head exhibiting a height in a first extending dimension 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, the lateral periphery 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 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 of the body, and which recessed portion o acts on the lateral periphery of the first head over a lateral width, when viewed perpendicularly to the first extending dimension, and over a polar scope, when viewed along the first extending dimension, and o exhibits a reduced diameter compared to the maximum diameter of the first head, when measured from the center 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 of the body, and which recessed portion o acts on the lateral periphery of the first head over a lateral width, when viewed perpendicularly to the first extending dimension, and over a polar scope, when viewed along the first extending dimension, and - a second head at an opposing end of the body in the first extending dimension, - the polar scope of the recessed portion is between 5 and 8 per cent of the circumference of the lateral periphery 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 of the recessed portion.