Ronstan Series 30 Ball Bearing Orbit Block™ - Double

The Ronstan Series 30 Ball Bearing Orbit Block – Double is purpose-built for sailors and boaters who demand reliable load management in demanding marine conditions. Whether you're setting up running rigging, controlling sail trim, or managing heavy loads aboard a cruiser or racer, this double block delivers the precision and durability that separates professional rigging from compromise. Ronstan's engineered design ensures smooth, efficient operation across years of saltwater exposure and continuous use.

At just 0.15 lbs and measuring a compact 2 x 2 x 4 inches, this block achieves the highest strength-to-weight ratio in its class through advanced all-composite reinforced polymer materials that resist corrosion while delivering exceptional durability. The ball bearing design ensures minimal friction and maximum efficiency when under load, reducing the physical effort required during sail handling or anchor operations. Multiple attachment options integrate seamlessly with standard deck hardware and rigging systems, allowing versatile installation on cabin tops, boom gallows, or rail systems without additional adapters.

Cruising sailors, racing crews, and commercial operators benefit most from this block's smooth, efficient load distribution and maintenance-free composite construction. The double configuration allows for controlled mechanical advantage systems that reduce strain on crew while improving safety during challenging conditions. Installation requires only standard fastening hardware, and the corrosion-resistant polymer eliminates the ongoing maintenance demands of traditional metal blocks—keeping your rigging system lighter, stronger, and ready for your next offshore passage.