A sheet of masking means (1) which extends in a first direction wherein the sheet (1) has its longest extension, comprising a plurality of flat masking means (2, 2a, 2b, 2c, 2d) with an upperside (3a) and an underside (3b), the masking means (2, 2a, 2b, 2c, 2d) comprising a corner portion (4a) which comprises a triangle surface which has a first side edge (5a, 6a, 7a, 8a) and a second side edge (5b, 6b, 7b, 8b) further comprising an angle μ which is defined between the first and second side edge where a first masking means (2a) has the apex of the angle μ directed perpendicular to the first direction a second masking means (2b) has the apex of the angle μ directed perpendicular to the first direction in an opposite direction in relation to the apex μ of the first masking means (2a) where the first side edge (5a) of the corner portion (4a) of the first masking means (2a) runs parallel to the first side edge (6a) of the corner portion (4a) of the second masking means (2b) a third masking means (2c) which has the apex of the angle μ directed in the same direction as the angle μ of the first masking means (2a), where the second side edge (7b) of the corner portion (4a) of the third masking means (2c) runs parallel to the second side edge (6b) of the corner portion (4a) of the second masking means (2b) where the first (2a) and third masking means are held together by a material bridge (9, 9a).