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.

Mold and Cast of BJD Knee Joint Ball Part with Magic Sculpt

1/6 Doll bjd Cow ball Joint doll not only make up the head or head with the body can be chosen - AliExpress

30cm Hand Make Up Bjd Doll 1/6 Move Joint Changable Wig Dolls Ball Joint Fullset Collect Ball Jointed Doll for Girl - AliExpress

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

Assembling porcelain ball-jointed dolls — Nymphai Dolls

Sculpt ball joint doll, 3d bjd model, bjd for print, 3d doll, toy design by Nowinstant

1/12bjd Doll Body Ball Jointed Doll Body For Gsc Head Dolls - Temu

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

How to Make a Ball Jointed Doll (with Pictures) - wikiHow

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

How to sculpt joints for ball-jointed dolls? — Nymphai Dolls

SacPero 1/6 BJD Doll Body Ball 8.2 in Jointed SD Dolls Nendoroid Body 40 Joints Girls Boys Body with 6 Set Spare Hands (Boy,Milky White) : Toys & Games