Spare Pins For Chain Reaction. This apparatus has been designed as means to demonstrate chain reaction, using ordinary matches. The apparatus consists of an aluminium plate with holes and mounting rod. One side of the plate has level surface but the other side has concentric protective channels milled out of the solid aluminium. Six metal pins are included for damping the chain reaction.Ordinary matches are required for the demonstrations but are not supplied as standard.Experiments should preferably be carried out in fume cupboard, due to amount of smoke generated by the matches burning. Please note: each experiment uses approx. one small box of matches.The apparatus can be used to demonstrate: An uncontrolled chain reaction; controlled chain reaction; partly controlled chain reaction.Replacement metal pins are available separately.