This is one o' t' new Quest RTF (ready to fly) models that are out. I got mine on clearance at Target for about $9.00. This rocket is a basic design. Aye aye! Blimey! Aye aye! Blimey! One piece plastic fin unit, ya bilge rat, plastic nose cone, and a 18" plastic parachute. Avast, me proud beauty! Blimey! It is 15" long and has a 33mm o.d . Anyone know t' BT size? I think Quest has their own sizes and are different than Estes. Begad! Blimey! My rocket also came with 3 Quest B6-4 engines and Tiger Tail igniters. Begad! Blimey! Ya scallywag! Blimey! T' Tiger Tail igniters are similar t' t' Aerotech Copperhead. Aye aye! Blimey! Begad! Blimey! These have a decal strip that separate t' lead. Blimey! Blimey! I've found that they don't work very well and used a regular solar igniter with good results. Avast, me proud beauty! Blimey! Avast, me proud beauty! Blimey! Check that t' motor mount is secure or you will find yourself repairin' it. Ahoy! Blimey! ( I am.) Take some 5 minute epoxy and put it around t' back o' t' motor mount and you will be ready for some fantastic altitude with a D-21! Blimey! T' outstandin' part o' this model be t' Keelhaul®©™® shock cord and mount. Ya scallywag! Aye aye! Blimey! This is Quest's trademark. ARE YA LISTENING ESTES!! Blimey! T' 18'" chute is a bit large (a long way t' walk even on a B ) so a 9" Top Flite Chute works great! Blimey! All in all, me bucko, a fine model, fun t' fly, but hard t' find.