Deffinately clackers!....
....made a brief comeback in my childhood (im now 20) but they were reduced to being made of plastic and on rigid plastic frames insted of string to avoid you hurting your wrists (spoil sport!)
My mum loved it when I brought them home....reminded her of when she was a girl...but hers had iron balls! So she always had black and blue wrists where they'd caught her.
She still beat me in a competition to se who was better at using the new ones
...what about those toys that you put round your ankle then there was a string with a ball on the end and you had to fling it round in a circle and kind of skip over it! Now been replaced with ones that light up and count how many you do etc etc...
Just shows that old toys are the best!