All tweezers are checked and labeled on the packaging for their designated use. 90% of the tweezers are part of a limited edition, with no certainty that they will be available again in the future. Our recommendation is to purchase your favorite tweezers in larger quantities so you can test them for suitability in your technique, and if needed, return them within 7 days. You will be responsible for the return shipping, but the tweezers you return must be in perfect condition. If anyone is interested in a tweezers for 0.03 thickness, please kindly contact us, and we will specifically check that tweezers for you.