We've all heard of buzzbaits and lures which are designed to kick out vibes to attract the pike.
Now Mepps have put some audio clips on their website, to give you an idea of how different lures make different noises.
"It's pretty easy to see the flash of a Mepps spinner blade as it's pulled through the water, but hearing just what it sounds like has been a well kept secret up until now," the site says.
"It took us a while, but we've managed to digitally capture the sound of several Mepps spinners as they are retrieved. And, what we recorded even managed to surprise us.
"Remember, what you are about to hear are the actual sounds produced by Mepps spinners as they are retrieved. These sounds have not been enhanced or altered in any way. We make no claim as to how fish interpret these sounds, but fish do hear them."
Of its Aglia "Musky Killer" spinner, it adds: "The sound of the #5 Aglia blade is steady and deep with a rapid repetitive thump. The Magnum Musky Killer blade sounds similar, but, the thump is deeper and slower.
"Both sound like a slow moving locomotive, and both are very easy to hear underwater."
Click here to go to the sound clips, then just roll you cursor over each spinner to hear what it sounds like.