Estes NC-20 Nose Cone Pack - Includes 4 Cones that fit BT-20 Body Tubes (003161)Estes NC 20 Nose Cone Pack includes 4 nose cones that fit BT 20 body tubes Assorted lengths and shapes (all same diameter) Also includes 4 nose cone pins that can be glued into the nose cones to allow a parachute and shock cord to be attached Please verify that these are compatible with your model rocket before ordering