The patent is still pending, but this soft snatch block might just become very popular for all sorts of reasons. It's strong, very light in weight and can be implemented without a line end. Their lightness means they're great for spares in the locker as well.
All you do is open the shackle, place the line in, connect the shackle to a mounting point and then wrap the velcro strap around the entire unit to keep the line in place. The gadget has a hardcoat anodized aluminium static block.
The static block design uses a large radius to minimize friction with slippery synthetic sheets and halyards. Use this for running line to 9 mm diameter, the extra load capacity should give you a huge factor of safety and long life.
It weighs just 2.1 oz (59 grams) and has a 5,000 lbs-f SWL, 10,000 lbs-f Breaking Strength, and should work very well with slippery synthetic line.
Manufacturer Colligo Marine is working on a larger size for running lines to 16 mm, and they will be available soon.