No, these are fixed sizes. You may however choose different orifice and colors. The Wonder Wave, Speed Bump, and Super Ribbed inserts are all considered 'super tight' in the sense that each canal is roughly 1/2 inch (13 mm). These inserts are NOT available in the original 3/4 inch (19 mm) or ultra tight 1/4 inch (10 mm) diameter canal. Each varies slightly dependent upon the texture of the inside canal.