1. Acrylic (acrylic polishing system)
2. Gel (gel system of the nail polish)
3. Clay-powder
4. Fabric technology (silk)

Each material has a different rate of contraction (as determined in laboratory conditions): the best is from 3% to 12% contraction, from 12% to 20% is a tolerable rate, and materials with more than 20% of shrinkage are not advisable to work with, since this may damage the natural nail. In the fabric technology and powdered clay is better to use respectively by 5% to 15%.
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