These are an ergonomic version of the standard Addi Rocket needles. The slightly rounded square needle tip is very comfortable to knit with for hands prone to pain when in use. We also find that these help immensely with knitting in cotton, linen, or silk. 

A moderately sharp tip makes knitting anything a breeze. We love the updated white brass coating on these for being super slick and fast, but without the nickel allergies the old version had. 

We like the 40" / 100 cm length for larger sized sweaters as well as blankets.