Ultra-light and compact sheathless pulleys that can be used as barber, cunningham, vang, lazy jack…

Made from anodised aluminium, these pulleys can be attached with rope, webbing or Dyneema buckle.

– Ideal material for kite-surfing, lazy-jacks, barberhaulers, cunningham and many other applications.
– RF8080 made of heavy duty plastic material, comes in a cardboard box of 2 pieces, there are 4 colours.
– RF8081 – the large model is made of hard, corrosion-resistant aluminium, there are 2 colours.


Available in four colour options – blue, green, grey and red with several attachment options, including webbing, pigtail, lashing and Dyneema® links, it will be the obvious choice for those kitesurfers, paragliders, control line deflections and purchase systems that require a lightweight high load capacity block.


With no moving parts Shocks™ provide ultimate durability and are maintenance free. They are ideal where sand and grit would compromise a bearing system or where regular flushing out isn’t possible. Their gentle 3-dimensional geometry is kind on lines.

NB: We know that Shocks™ are easily worn/damaged from salt and grit embedded in wet rope, and that nothing in this world is maintenance free. We always recommend fresh water rinsing of all hardware products.


Shocks™ are designed primarily for ‘soft attachment’; spliced to a line end or lashed in place. The elongated attachment aperture is also ideal for webbing attachment, ensuring the intended orientation is maintained.


The applications for Shocks™ are virtually limitless, including numerous high performance dinghy and small sailboat rigging applications including tweakers, vangs, trapezes, cunninghams, barber haulers and kite bridles. They are also handy on larger boats for uses such as lazy jacks, sail covers, tie-downs, ladder and motor hoists.


At a mere 2.5g (0.1 oz), Shocks™ are outstanding performers in the strength and weight stakes. The clever design and exacting finishing also provide excellent free running at moderate changes of angle. Shocks™ accept lines from 1.4mm (1/16”) up to 8mm (5/16”) and function with hi-tech uncovered braids as with traditional double braids. They are available in colour choices to help keep complicated rigging configurations more organised.


  • Performance & versatility
  • Ultra lightweight
  • Ultra compact
  • Durable
  • Colour coded
  • Impact resistant
  • Small line optimised
  • High load capacity
  • Soft attachment compatible


Unlimited uses, including kitesurfing, paragliders, sports kites, power kites, stunt kites, depower kites, traction kites, for deflection or purchase system on control lines


Anodised aluminium

RF8080 Maximum Attachment – 8mm wide / 5mm diam. (5/16″ wide – 3/16″ diam.)

RF8081 Maximum Attachment – 10mm wide / 10mm diam. (3/8″ wide – 3/8″ diam.)


ref. corta ref. fabricante descripción Ø
max. cabo
Ep mm ancho alto fijación carga rotura kg peso g
GBE RF8080BLU-2 Backing card with 2 RONSTAN SHOCKS – colour blue 5mm 23 15 8,5 8x5mm 350 2,5*
GBF RF8080GRN-2 Backing card with 2 RONSTAN SHOCKS – colour green 5mm 23 15 8,5 8x5mm 350 2,5*
GBG RF8080GRY-2 Backing card with 2 RONSTAN SHOCKS – colour grey 5mm 23 15 8,5 8x5mm 350 2,5*
GBH RF8080R-2 Backing card with 2 RONSTAN SHOCKS – colour red 5mm 23 15 8,5 8x5mm 350 2,5*
GBW RF8081BLU Backing card with 1 RONSTAN SHOCK – colour blue 10mm 36 25 14,5 10×10 1000 12
GBX RF8080R Backing card with 1 RONSTAN SHOCK – colour red 10mm 36 25 14,5 10×10 1000 12

PDF download

Weight 1 kg
Dimensions 15 × 6 × 8 cm


Blue, Green, Grey, Red

Rope size

10mm, 5mm


Backing card with 2 RONSTAN SHOCKS, Backing card with 1 RONSTAN SHOCK

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