m720 has adjustable weights)- Its clicks are not loud. However, I?m very happy with it, as I did not want to use adhesive on my bike, as other products have, and I totally recommend it. Also, it has just the right amount of stretch. Quick fix is listed above though! But if you want the unadulterated truth, warts and all, beauty and all, this is one of the most acurate headphones on the planet. Walking with fake lining is like walking on a bare floor. Love this shirt! The first pair I ordered in a size 9 was defective but I didnt realize it since I had never worn this brand or style of shoe. She wears a size 5 in other shoes and so we ordered a size 5. Using these for wood bead wreath.