Similar to the late Grym, the Kastaplast Vass is made for long and smooth S-Curve throws and tailwind bombs. It's a highly workable, big distance driver for the common player. Big arm throwers will find it to be an incredible disc for long turnovers with tons of glide.
 
Kataplast K1 is a unique plastic blend manufactured in Sweden. This disc plastic has an excellent feel. It is moderately grippy, but not sticky and is extremely durable. K1 plastic has a similar feel to Prodigy 400G or Prodiscus. K1 is a stiffer blend than Kastaplast's K2 plastic.