Estes Mini Bertha Launch Set. Tailored for beginners, this miniature reincarnation of an Estes' favorite offers an exciting introduction to the world of model rocketry. Powered by mini engines (13MM), the Mini Bertha can reach a max altitude of 650-feet on the recommended A10-3T engine. Watch in awe as this compact rocket soars into the sky, delivering an awe-inspiring spectacle that captures the excitement of soaring through the skies. Includes Mini Bertha rocket, mini launch pad, launch controller. Requires (4) AA batteries, not included.