-Outer size 9.0mm, inner dia. 7.0mm x2 types -Outer size 7.0mm, inner dia. 5.9mm x2 types -Outer size 5.0mm, inner dia. 3.0mm x2 types -Outer size 3.0mm, inner dia. 2.0mm x2 types -Outer size 2.0mm core x2 types