Nylon lines sold in Japan are rated by breaking strength, which is a little different from lb-test used in the USA. For example, JP12lb lines should be rated at 10lb in the US. JP4lb=US3, JP6lb=US4, JP8lb=US6, JP10=US8, JP14=US12, JP16=US14, JP20=US17. Please choose line by thickness if you want a line with specific strength.