Ronstan RF28109 Series 25 Orbit Ball Bearing Single PulleyThe Ronstan RF28109 Series 25 Orbit Ball Bearing Single Pulley is a lightweight, low friction sailing block designed for high performance dinghy, skiff, trailer sailer, and sports boat applications in demanding New Zealand sailing conditions. As part of Ronstans advanced Orbit Block range, the RF28109 delivers exceptional strength, smooth line handling, and minimal weight for efficient sail control and racing performance. Featuring a compact 25mm

A PTFE perimeter strip prevents rope snags and drop-outs

flexible routing with a tie-off option

They are made of brass and other non-ferrous materials

making it easy to integrate into custom sail handling configurations

Available in multiple lengths to suit your needs

Manufactured from marine-grade 316 stainless steel

Improves onboard safety and comfort

scratches P1000 or finer) with a built-in durable wax finish

360° stainless-steel swivel shackle allows full rotation

jib control systems

Moisture displacement

Trusted worldwide and made to last