The material is hard enough to be sturdy and durable.
Specifications:
1: Types : 12.7mm Quick-drying cartridge
2: ink: Solvent fast drying black ink, please note it is inkjet not engrave so wait ink dry
3: capacity: 42ML
4: Color : Black

6: Voltage: 8.6V~9.0V
7: Pulse width: 1.9s~2.2s
8: DPI: 600DPI
9. Length: approx 10cm/3.94