Wives and girlfriends of men thought to be involved in gun crime will be sent a Valentine's Day card urging them to keep their partners away from guns.
The cards are being sent by Merseyside Police, Citysafe and Safer Knowsley Partnership.
The slogan reads: "This Valentine's Day don't let him break your heart. Guns ruin lives and break hearts!"
Det Ch Supt Paul Richardson said he hoped it would encourage men and women to talk about the dangers of guns.
He added: "There is a very real danger to all involved in gun crime and we urge the women in the lives of these men to help put a stop to it before it is too late.
"These women need to show tough love to ensure their partners don't end up serving a lengthy prison sentence or even worse - seriously maimed or dead.
"We recognise that calling us with information will be a very difficult decision, but it may save the life of their partner and maybe someone else's."