Add-
style="width: {$cell_width}%; border-top:1px solid #cccccc; border-left:1px solid #cccccc; border-right:1px solid #cccccc; border-top-left-radius:10px; border-top-right-radius:10px;" in each td and after each td ends add
<td><img src="skin/common_files/images/spacer.gif" width="10" height="5"/></td>
-This code is for 4.4.2 Pro products_t.tpl.I have researched and try and after that successfully done.