hard to say, they make and sell a ton of different brands
you might get lucky by actually asking the store you got it at, what brands they USED to carry and see if they can help that way

I have used a lot of them over the yrs , never got more than a yr out of anyone , of all different brands, most don't make it 6 months to be honest
might have just got a odd ball one the first time??
Trophy rocks , do last about the longest IMO
but many deer in many place I have place them could care less about them>>
minerals are a hit or miss based on what your area deer needs or NOT are!
one of them what works here , doesn't always mean it works every where deal!