Estes BT-60 Body Tube Pack - Includes 3 Tubes that fit NC-60 Nose Cones (3089)Three BT 60 body tubes per package. Use with NC 60 nose cones (sold separately). Strong and lightweight plain brown tubes with a thin wax coating Used for custom model rockets or repair work Can be cut to needed length. Use tube couplers to join tubes of the same diameter, or use as support while cutting. Inside Dimension 1. 595 in (40. 5 mm) Outside Dimension 1. 637 in (41. 6 mm) Length 18 in (45. 7 cm)