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Materials:
* ring mechanism
* bookbinding cardboard (2-3 mm thick)
* plain cardboard (~180-200g/m2)
* packaging or self-adhesive paper
* contact glue or glue stick
The dimensions of the parts for the A4 binder with a ring diameter of 3-3.5 cm:
32 * 27 cm (two parts made of bound cardboard)
32*4 cm (one piece of bound cardboard)
32*2.5cm (two pieces of ordinary cardboard)
The dimensions of the parts for the A5 binder with a ring diameter of 3-3.5 cm:
24*19 cm (two pieces of bound cardboard)
24*4 cm (one piece of bound cardboard)
24*2.5cm (two pieces of ordinary cardboard)