There are 4 different types of knitting needles: Fixed circular needles to knit in the round, double pointed needles for sockknitting, straight single pointed needles and the Knit Pro interchangable knitting needles
Knitting needles made of wood or bamboo are best for knitting with slippery yarns like silk. It is most enjoable knitting with them in the hot summerdays.
For taut knitting nickel plated metal needles are recommended.