Part 1
Part name: Cone 4 x 4 x 1 Hollow No Studs
Part description: like Cone 4 x 4 x 2 Hollow No Studs but only 4 x 4 x 1
Part usage: spacecrafts, rockets (saturn V), engines
Part 2
Part name: Cone 6 x 6 x 1 Hollow No Studs
Part description: like Cone 4 x 4 x 2 Hollow No Studs but 6 x 6 x 1
Part usage: spacecrafts, rockets (saturn V), engines
Part 3
Part name: Cone 6 x 6 x 2 Hollow No Studs
Part description: like Cone 4 x 4 x 2 Hollow No Studs but 6 x 6 x 2
Part usage: spacecrafts, rockets (saturn V), engines...