Estes Delta Clipper #2067 Tubes used in this kit are non-standard. The specs. in the catalog and on the box are INCORRECT! The specs say the Dia. is 1" however the tubes measure 1.084". The sizes given here are taken directly from the actual kit parts and have been taken with a dial caliper. Q Desc Stk Num Size Other 1 Plastic Nose Cone N/C 4.6"L Shoulder .7"L 1.034" Dia Has molded on tube adapter. 1 Body Tube(Main) N/C 13.275"L 1.084"OD 1.034"ID .025"Wall 1 Body Tube(Upper Fin) N/C 4.75"L 1.084"OD 1.034"ID .025"Wall 3 Slots 1.675"L .093"W .7"From End 1 Body Tube(Lower Fin) N/C 3.2"L 1.084"OD 1.034"ID .025"Wall 3 Slots 1.675"L .093"W .75"From End 1 Engine Tube BT-50 2.75"L 1 Engine Tube BT-50 3 3/16"L 2 Tube Joiners N/C 1"L 1.034"OD .990"ID .022"Wall 3 Centering Rings N/C .25"L 1.034"OD .990"ID .022"Wall 1 Engine Block EB-50 .25"L .950"OD .750"ID .1"Wall 1 Engine Block N/C .25"L .950"OD .850"ID .050"Wall 1 Balsa Sheet BFS-30 4"W 9"L 3/32"T 1 Streamer 60"L 2"W Orange Vinyl 1 Shock Cord 24"L 1/8"W Elastic 1 Decal 37578 5"W 6.75"L Yel/Blk on clear self stick