Multi colored pipe cleaners are a great way to mark branches for future consideration. In this picture copied from Crataegus Bonsai blog post Deciduous Early Development Part I: Japanese Maple October 5 2019 red pipe cleaners are being used to indicate which branches will be pruned the following spring. Colorful pipe cleaners are an easy way to mark future adjustments that are best made seasonally.
Pipe cleaners indicating work or observation required on this forest group.