Certain types of cylinder locks, including some used for locking laptops, are vulnerable to thieves wielding nothing more than a ballpoint pen. The attack works simply by forcing the empty pen cylinder into the lock and twisting it. Kensington, which makes laptop locks, issued a statement saying that after the vulnerability was found, "we rigorously tested our full product line to identify potential vulnerabilities. Based on our testing, we determined that the vast majority of our products are not susceptible to recently publicized lock-picking techniques. For the small percentage of our locks that are potentially susceptible, we are offering our customers the opportunity to exchange these locks for an updated version at no charge." To find out if a Kensington lock is susceptible, call 888-724-8624 and give them the number imprinted on the key.