I worked the prototyps for Job Verbunt in Netherland.It are quattro asymm. weedfins in G10. They are good. Here the adress:jobverbunt@equipe-trading.nl or:www.equipe-trading.nl Iwork other weedfins,in 100% carbon. My hobby are Rake 30°speedfins. The 22cm made with Thomas Döblin topspeed 50 knots. In work,but look: www.designlessacher.eu Wolfgang