These rock climbing mugs are sure to add a bit of challenge to any climbers morning coffee or tea! Each Rock Climbing Mug holds 12 ounce of your favorite drink and comes with a rock climbing hold attached for a handle. The climbing holds are created by Climbergoods and were designed to be suitable for expert and novice climbers alike! Each climbing hold has a socket-cap screw in it. This is the same type of hardware used in most climbing gyms today.