Size ( For reference): S - Outer Diameter 10mm, Height 8mm M - Outer Diameter 11mm, Height 8.5mm L - Outer Diameter 13mm, Height 9mm Catheter Diameter: 4.5mm ( - 0.5mm) Number of packages: black red S(12pcs small), black red M(12pcs Medium), black red L(12pcs Large ), black red Mixed(4pcs s+4pcs M, 4pcs L); white red S(12pcs small), white red M(12pcs Medium), white red L(12pcs Large ), white red Mixed(4pcs s+4pcs M, 4pcs L); white blue S(12pcs small), white blue M(12pcs Medium), white blue L(12pcs Large ), white blue Mixed(4pcs s+4pcs M, 4pcs L);