Mr Hobby Round & Triangle Masking Sheets GT-71. The sheets are pre-cut into triangles and circles, making them easy to use. They can also be used to fill gaps between tapes or to create spherical moldings. When doing detailed masking, you can do so accurately and without stress. Set contents: - Dimensions: 100mm x 175mm - 1 round masking sheet (φ5mm, φ3φmm) - 1 triangular masking sheet