In support of the new M1 MacBook launches, we are pleased to offer you the option to purchase an insert to update your BookArc. This means that if you want to use your new MacBook in closed-clamshell mode and already own our most recent BookArc, you can simply add the updated silicone insert for the perfect fit. In addition, for a limited time we have discounted the current BookArc model since our new BookArc isn't yet available with the new insert, you can purchase the current BookArc + the new insert at the same price as the new model will be. Please check the compatibility chart before purchasing to make sure you have the correct BookArc (inserts are only available for our most recent BookArc version and will not fit models pre 2015)