They do have kits with multiple size magnets in them. BUT I will confess that after I read a multitude of reports on magnets and one night my foot hurt so bad I couldn't stand so I took the magnet part of a flower on my frig and taped it to my foot. It seemed like about an hour and the swelling was gone and the pain as well, and didn't return for a week. Since I have the covering on my bed, my entire body if subjected to a 'positive energy flow' nightly and my aches and pains are a thing of the past. I thank God every morning when I literaly spring out of bed to begin my day ....I use to barely crawl out and was achey all day...and ladies at close to 64, I'm no spring chicken. My mother tried magnets for her gout and says shes cured, after years of terrible pain. Cheap prescription, and NO side effects.