K1 is Kastaplast’s premium plastic, and the blend the whole range is built on. Firm with some give, semi-translucent, and very durable. Sixteen moulds are listed in it.
That’s the all-conditions Kastaplast plastic. It holds flight for a long time and keeps grip when wet. K1 Glow adds a luminous fill, K1 Grind is the recycled version, K1 Hard is a stiffer run.
It’s on the firm side in the cold. K1 Soft is the flexier version if that’s a problem.
