These gender reveal cannons are spring-triggered and so don’t have any chemicals / accelerants / explosives / sparks etc. They come identically packaged, with a removable stick upon the cap so that the person responsible for buying the correct gender will know which to buy. The can then remove the label and nobody would be able to tell the difference before triggering the device. The device contains confetti and stringy materials of either pink or blue to denote the gender of the unborn baby.