Check if item is a folder

Hi,

Ihave an array like $a = gci and I am passing $a through a foreach statement.

How can I check if the item in the array is a folder, so like

if $item is not a folder then delete.  I tried this forst but its not working

remove-item $filepath -force | Where-Object { -not ($_.psiscontainer) }

Alter De Ruine