Sofa backrest hinge can change sofa size , when moved front, sofa size is small ,moved back , sofa size is big, you can have better relaxed position , can put your leg on the sofa . your back always can supported comfortably .
Top size:10*10cm, bottom size:14*8cm. Tickness:4.0mm . Height :280mm, 230mm.
usually, 10pcs/ctn , weight about 26.5kg /ctn.