Yeah I have used those but never had any success with them, the idea there is the same as salt impregnated worms and grubs. With the ones I do they hit those even better than live emeralds. I have refroze these and they still still work real good. I started freezing them for use when the emeralds are not available but I haven't bought any since I started using these 3 years ago. I put them on the hook still frozen and they still hit them.