SD13 are Volks' third range of SD type dolls released. They are meant to represent children of around 13 years of age, a little more mature than the original SD10. They are roughly 57-62cm (22-24inches) tall, and have approximately a 22-23cm (8.7-9.3inches) sized head. Most of them can also wear DD sized wigs, and the newer ones often fit better in DD than SD size. SD13 are the same size as the Tenshi type SeiRei.