This is a custom nose cone for an Estes model rocket. This one fits a "Code Red" model rocket that I picked up at Fry's Electronics, but the concept could work for any rocket--just tweak the diameter to fit into the body tube. Print out and slap on yer rocket. I printed with one shell and no support, and my part came out weighing 5g, compared to the 15g of the original (and much longer) nose cone. There's a hole at the base of the part to tie the parachute and shock cord. Enjoy, and happy launching! If you have a successful launch with a custom cone, share it in the comments!