★★★Difference between WK220A type and B type★★★ ================== WK220A type = single left + semi-double right WK220B type = Semi-double left + single right WK240 is only one type, semi-double + semi-double. WK200 is single + single, so there is only one type Bunk bed with shelves, lighting and power outlets, highest quality Japanese nano pocket coil A type, wide K220 (S+SD), a choice for your child's future The traditional Japanese sleeping position, "kawaji" (the row of four futons), allows you to get a close look at your child's growth. One study found that children who sleep with their parents have significantly lower stress levels and a higher rate of REM sleep, and it has been pointed out that these values ​​may have a significant impact on children's development. In recent years, more and more people are sleeping in beds with their children in homes that have flooring. For such people, we have created a specially designed bed that will allow the whole family to sleep comfortably.