MONSTERTUBE/MONSTERTUBE JR This is a comparison shot of the opening diameters on each of the tubes side by side-It will give you a better idea of the size difference. MONSTERTUBE STATS: 3.5"opening 12" long 22" around 7" diameter MONSTERTUBE JR STATS: 2.75" opening 12"long 15" around 5"diameter NO PUMP INCLUDED