Same size as Estes BT20 body tube. Smooth glassine coated finish! Estes quality part - cheaper price! This body tube can be cut to a shorter length and used as a 18mm engine tube for Estes "A", "B" and "C" engines. Direct replacement for ASP, Estes, FlisKits and other similarly sized model rockets. Grid spacing in photo is 1/2" | 
