- The back can have 1 or 2 attachments depending on the model and the shape of the pin.
- The shape of the pin can be fully customised and does not have to be a standard geometric form.
- The design should avoid small details because they cannot be reproduced.
- The pin can only be customised on the front.
- All the edges of the design, both those on the outside and those that divide one colour from another, will be the same color as a base.