Refill cartridges for the dizzy gels: battery-operated fun vibrating gel pens. Perfect for drawings, sketching, scrapbooking, and invitations. It shakes into the craziest, dizziest gel pen! 2 Gel ink cartridges are included. Specifically designed locking tip works with a large variety of pens, pencils, markers, crayons, and more! Smoother writing, and unique gel pen refills to fulfill all your artistic needs. Easy-to-change cartridges. Gel ink refills for gel pen, ideal for adult coloring books, scrapbooking, crafts, handmade cards, photo albums, journals, study notes, and more. Refills only includes: 1- Blue and 1- Red Additional Details ------------------------------ Product description: Refill cartridges for the dizzy gels: battery-operated fun vibrating gel pens. Perfect for drawings, sketching, scrapbooking, and invitations. It shakes into the craziest, dizziest gel pen! 2 Gel ink cartridges are included. Specifically designed locking tip works with a large variety of pens, pencils, markers, crayons, and more! Smoother writing, and unique gel pen refills to fulfill all your artistic needs. Easy-to-change cartridges. Gel ink refills for gel pen, ideal for adult coloring books, scrapbooking, crafts, handmade cards, photo albums, journals, study notes, and more. Refills only includes: 1- Blue and 1- Red