Pipe weighs 2.2kg (without ballast).  Our products are ready to assemble by hand noting the following:  We recommend filling Pipe with dry silica sand to act as ballast - silica sand is also known as silver sand & this is the type you’ll find at garden centres or pet shops - one 5kg bag is normally enough to weigh down Pipe for an average size cat but we recommend buying two bags as this will completely fill the Pipe.  Down Pipe & Stand Pipe can also be part filled with sand for extra ballast if required along with the legs on Stool.  To install Down & Wall Pipe you’ll need a medium size cross headed screwdriver & a drill.