thickness back +Shaped sponge+ WHITE back shell
+Alluminumalloy armrest (with pad)+with seat shell
+alluminum alloy five star base
+STG Weight-activated mechanism (4 position lock );

thickness back +Shaped sponge+ WHITE back shell
+Alluminumalloy armrest (with pad)+with seat shell
+alluminum alloy five star base
+STG Weight-activated mechanism (4 position lock );