They claim to use special rubber bands lol... I bought #16, 18, 19 rubber bands at Office Max. see above post for breaking strength. Ive used the offshore, Sepps, and cannon clip releases, and still do when Im fishing shallow with downrigger (20 to 30 ft.) they are quick and easy. But it does take practice to figure out where to place line in the clip and the tension needed when going at lower depths. its aggravating dropping ball down to 80 or 90 feet with a clip and then it breaks loose so you reel everything up and start over. The advantage I see with the rubber bands is the consistency with release strength. If I want about 4 1/2 pounds I use the 16.....in deeper water with a little more drag...maybe use the 18 or 19. I dont claim to be a downrigger expert and dont take offense to anyone not agreeing with me on my preference. Its up to people to choose their own methods. Just throwing some ideas out for anyone interested.