The glass head is heat resistant. 
Precision tempering and hardening produce a strong yet elastic pin. 
These pins are the best choice to mark thin fabric and detail work. 
2x Black 0.50x36.0mm 
2x White 0.50x36.0mm 
2x Light Blue 0.50x36.0mm 
2x Red 0.50x36.0mm 
2x Yellow 0.50x36.0mm 
Made in Japan