A pink plastic fly swatter with its business end shaped like a hand.
Bavarian boys performing a flyswatter spank dance (m/m
A fly swatter is an instrument used to swat flies and other insects such as mosquitoes. Most fly swatters today are made of plastic. The swatting end is perforated like a sieve or grid to reduce the air resistance (to swat faster) and to counteract the 'air cushion' effect that a non-perforated surface would have, which would help the insect to escape sideways.
Fly swatters can also be used for spanking, although they are not too popular for this purpose compared to other household items (such as hairbrushes or wooden spoons, for example).
Fly swatters are rather lightweight and produce mostly sting and little or no thud. In other words, the pain felt is a sharp sensation on the skin and does not reach the deeper tissue and muscles.
Occasionally one can also find fly swatters made of leather; these are probably not bad for spanking either.
An example of the fly swatter in spanking art is found on Handprints here (F/f). Warning: