This is a pack of four Estes BT-5 Body Tubes. These high quality spiral wound paper tubes are compatible with kits that use a BT-5 body tube. Four body tubes per package. Tube couplers are required to connect tubes of the same diameter. Works with the NC-5 nose cone.
Specifications: Inside Dimension: .518 in (13.2mm)
Outside Dimension: .544 in. (13.8mm)
Length: 18 in (45.7cm)