I built this reactive target using multi coloured chalk sticks. Its really cheap and easy to make - and a stack of fun - especially the 6mm target!!!!! 
If you enjoyed my video or found it useful - please take the time to hit 'like' and 'subscribe' on the youtube page - thanks folks
If you enjoyed my video or found it useful - please take the time to hit 'like' and 'subscribe' on the youtube page - thanks folks