36 pcs  uni-ball Signo RT refills UMR-83 

For UMN-138   UMN-138S 

0.38 mm gel ink 

 BLUE

steel tip  .light proof

water proof  .super smooth

long shelf life 

0.38MM ball  

green;Active,Energetic,fun-loving,upbeat.

3 colours available;

BLACK.  BLUE.  RED.

**you can change any colours by leaving message.

Made in Japan by MITSUBISHI PEN CO.LTD