It’s just black electrical tape, but it’s made by 3M and a roll costs just [amazon_link asins=’B00EZPZ9CK’ template=’PriceLink’ store=’boingboing’ marketplace=’US’ link_id=’251d24a2-ccb0-435d-ade7-cb22648a2749′] on Amazon. It’s temporarily out of stock but you can still buy it at this price and you’ll get it when Amazon gets more.
This roll of 3M electrical tape is supercheap on Amazon right now
