X-3 is a very unreliable form of plastic explosive. While it does a huge amount of damage it may either fail to go off or it may explode in the face of the person laying the charge. (1 in 5 chance of this happening)
X-3 Explosive Pocket Rare 8D6+4 Unreliable 500.00eb
XR-1 is a very handy low ordinance explosive that has the special property of being magnetic. This is very useful as it can be used to stick onto fuel tanks etc. without any other adhesive materials.
XR-1 Explosive Pocket Rare 1D6+4 Very Reliable 500.00eb