high quality nylon

S size 28cm(bottom length)*38cm(height)*18cm(bottom thickness)
L size 31cm(bottom length)*44cm(height)*22cm(bottom thickness)
Maybe with 1-3cm size error.

There are two kinds wheels,one kind with total two wheels,can't climb the stairs,the number 1,2,5,6,9 and 10 are two wheels style,

the other kind with six wheels,can climb the stairs,the number 3,4,7,8,11 and 12 are six wheels style.

When you order,please kindly pay attention to the above message.
If you have any questions,please contact with me.Thanks.