BJD includes SD, which is a type of BJD.

BJD mainly refers to a spherical joint humanoid made of resin. It adopts the structural theory of ball joints. The limbs, torso and each joint are made of resin, with a delicate feel, and each component is a rubber band/ S hook/thick cotton rope/aluminum wire and other materials are fixed together. Each joint can be flexibly assumed into various poses.

SD doll is: Made of Japanese resin. The body cannot move at all, but it has a complete body and joints that can be assumed in various poses. Just like human beings can change their clothes, hair, facial makeup, and even their eyeballs at any time. The styles of clothes are ever-changing, and any clothes that humans can wear can be put on SD. The eyeballs can be replaced at will, and the direction of the eyes can also be adjusted to express sight.

The SD doll developed by Volks is not only the pioneering work of BJD, but also the standard and model for all future BJD products. Nowadays, all Korean and Japanese BJD dolls are based on the size and basic body shape of SD dolls. SD dolls are absolutely authoritative in many doll manufacturing technologies. So much so that when BJD is mentioned nowadays, it is said to be SD doll, but SD is just a type of BJD.

Extended information:

For the maintenance of BJD dolls, ensure that the space where the BJD is located is dry and clean. If it is usually stored in the closet, please place a moisture-proof agent or bamboo charcoal bag in the closet. . Try not to let the BJD's body come into contact with water. If it has to come into contact with water due to shooting needs, the doll must be completely air-dried before being put away. Avoid moisture causing the S hook and magnet inside the doll to rust.

Please try to choose light colors for all underwear (such as underwear, vests, etc.), such as flesh color, pink, white, etc. Please do not choose dark colors such as black or dark blue to avoid color fading from clothing and staining the doll. Wear a mask on your doll every time you put it in your bag or sleeping box to prevent makeup from being damaged by friction or eyelashes from being knocked down.

Reference material: Baidu Encyclopedia_BJD

Reference material: Baidu Encyclopedia_SD