Yes, I had to stand there asking myself what size my bits are. However, they make it pretty simple. The suitably crunchy-looking lady at the counter assured me that they are better than sliced bread, and for this job I damn well hope so. Anyway, the instructions were simple and so far so good. I will keep you posted, whether you like it or not. It should pay for itself within 6 months, anyway.
Also, WTF New Zealand? This kind of technology as an environmentally friendly alternative to tampons, and you can only find one variety tucked away in the back corner of a hippie shop? These things should be out the front of mainstream pharmacies!