Hegar Sound - 7 to 8 mm

Used it for the first time last night and was surprised by how smooth the finish is between the two sizes. The gradual step up feels deliberate, not abrupt, which made the whole experience much more comfortable than I expected.

The smaller end is perfect for beginners like me, and the smooth steel makes insertion comfortable. I appreciate being able to buy just one size to test instead of a whole set.

The two different diameters on each end make it easy to step up gradually, and the smooth surface slides in without much fuss. Nice to grab a single one when you're not ready to commit to a full set yet.