More detail at: http://nexy.com/shop/blades/54-calix.html#sthash.66QrPXFf.dpuf
Calix quote from Blade Designer...
"Calix is only 4.9-5 mm thick.I designed Calix that way because I wanted players to have a flexible feeling when using it to attack. A thin blade gives better accuracy because you can feel the ball more, but at the same time the blade has to feel solid. When the ball goes deep into the sponge and contacts the surface wood it’s important that the blade can solidly withstand the impact — not feel shallow and weak"