Features: 1. 36pcs/38pcs Optional: Include numbers and letters patterns. 2. High Hardness: Hardened Steel Incredibly Durable and Long Lasting! 3. Comes with Storage Case: Keeps all the punches safe and organized. 4. Stamps can be used on various materials. Including metal wood plastic leather aluminum and so much more! 5. Simply align on application surface and gently tap with tool to engrave or emboss. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Type: Number and Letter Steel Stamp Set Specification: 4mm Material: Cr40 steel Surface treatment: sandblasting Hardness: 50-55 degrees Features: Printed specifications and fonts on the side of the stamp. Include: 36pcs(A-Z+&+0-8 (6 9 interoperability))/38pcs optional (A-Z+&+0-8 (6 9 interoperability) + heart shape + auxiliary tools) includes: Choice 1: 1 set(36pcs) x Number and Letter Steel Stamp Choice 2: 1 set(38pcs) x Number and Letter Steel Stamp "