there could be a kind of small diference in weight depending on tubing used, i dont know about the wallsizing in inches but you need about 2mm of wallthicknes when bending with a compresionbender (i only have experience with a HUTH bender) or the tubing will deforme horribly while a bandrelbender can bend tubing being alot thinner, i like to mandrelbend tubing with 1.5mm of wallthicknes it usuly bends nicely and the pipes will be noticeable lighter than with 2mm, atleast with 2½" and 3"
