How does the joint of BJD work?

The joint of BJD is made from the ball structure and connected with TPU coated wire rope, so as to keep the adjustability of the doll.

New 1/6 Handmade Resin BJD MSD Doll Ball Joint Dolls Girl Gift 10 Ahtu Full Set

A Simple Guide to Ball-Jointed Dolls (BJD) - Galaxia Dolls

Ball-Jointed Dolls, Ball-Jointed Doll Wiki

Fashion Doll Scale Fairy Ball-joint Doll BJD 1/6 Scale STL Files Only Supported Files Included

Porcelain Ball Jointed Dolls everyday art by Kathy O'Connell

1/4 Handmade Resin BJD SD Ball Joint Dolls Girl Women Gift Dorelia 16 Full Set

Making BJD joints!

Assembling porcelain ball-jointed dolls — Nymphai Dolls

Making my first BJD doll: Part 1 - Rough sculpt — Adele Po.

I want to make my own BJD

Ball joints are still weak : r/BJD

An MFA's Definition of Ball-Jointed Dolls (with pictures!) — Capita Mortua Arts

Ball Jointed Doll Maintenance: How to Clean and Care for Your Dolls – Dolk BJD

BJDGuide — Single Jointed vs Double Jointed