Estes Big Bertha Model Rocket Kit, Skill Level 1 - EST1948 Underworlds It ensures easy and accurate

It ensures easy and accurate charging

What makes the ball diff really special is its unique ability to be tuned to whatever track you are running on

for awesome wheelie action and roost-tossing wheelspins

Upgrade your Redcat Ascent-32 with Injora Stainless Steel Center Drive Shafts for reinforced durability

Tire Width/Diameter: 24/64mm (Front & Rear)

Estes Big Bertha Model Rocket Kit, Skill Level 1 - EST1948 Underworlds It ensures easy and accurateBig Bertha is an Estes original! She's an all around Estes favorite that has truly withstood the test of time. Over the decades, Big Bertha has been most modelers' first big build. If you've never flown a Bertha, get one and launch it. Once you've flown it, you'll take it to every launch! The Big Bertha gives you a slow, realistic liftoff. What a thrill it is to watch! Propelled by powerful standard Estes engines, this beauty travels to 500 feet and