NE Brand / D&K Honda 10 x 1.6mm valve guide O-ring. This goes on both the intake and exhaust valve guide. This is another super common size Honda o-ring. Goes on way too many bikes to list here. check the OEM number to be sure this is what you need.
10mm is the inner diameter.
Equivalent to Honda OEM part number: 91301-200-000
Fits Honda:
CB125S - 1979-1981
CB125TT - 1990
CB250 Nighthawk - 1991-2008
CB400F Super Sport - 1975-1977
CB400T Hawk - 1980-1981
CB400TI Hawk I - 1979
CB400TII Hawk II - 1979
CB450SC Nighthawk - 1982-1986
CB450T Hawk - 1982
CB550F - 1975-1977
CB550K - 1974-1978
CB550SC Nighthawk - 1983
CB650 - 1979-1982
CB650C Custom - 1980-1981
CB700SC Nighthawk S - 1984-1986
CB750 Nighthawk - 1991-2003
CB750C 750 Custom - 1980-1982
CB750F Super Sport - 1979-1982
CB750K - 1979-1982
CB750L Limited Edition - 1979
CB750SC Nighthawk - 1982-1983
CB900C Custom - 1980-1982
CB900F Super Sport - 1981-1982
CB1000C Custom - 1983
CB1100F Super Sport - 1983
and many, many more . . .