What makes a useful training set?
Small, consistent increases between sizes are easier to control than large jumps. Check the maximum diameter and insertable length of every included plug.
Progress at your own pace
There is no fixed schedule. Stay with a comfortable size until insertion and wear feel controlled, and move back a step whenever needed.
Shape, material and base
A gradual taper supports insertion, while a defined neck can improve wearing comfort. Every plug must have a secure flared base or reliable stop.
Lubricant and cleaning
Use plenty of compatible anal lubricant and never force progression. Clean each item according to its material before storing it dry.