https://www.thepracticeshoppe.com/collections/digital-downloads/products/twinkle-rhythm-flashcards-digital-downloadI love to use flashcards with my students and kids.  I don't use that at every lesson or practice session, but it's a nice break from playing if that is what is needed.  My 4 year old knows all of her notes and symbols just from going over these once or twice a week.  I copied them on colored cardstock and had them laminated and punched a hole and put a binder clip on them.  It took time and money.  For my students I tell them just to come to the website and download them.  I don't care if they print it on white paper or get fancy with the cardstock and laminating.  It's all about the information.