Washing the 3M surface with soapy water (however strange that seems) and heating the sticky surface with a hair dryer can renew some of the original stickiness. Be careful not to burn the adhesive, yourself, or your headphones.
Additional clasps are available from our store; however, we don’t sell the adhesive separately.
You can buy the 3M material here:
The six-pack is a little thicker than our 3M pads and you'll have to trim them a bit, but the adhesive is still 3M and will stick the same way our stock pads will.