Sketch Stick pencils for eyes and brows are retractable and refillable. Eye pencils are enriched with avocado oil for ease of application. Brow pencils are Vitamin E enriched. Eye and Brow pencils are complete with blending tools on the opposite end of the pencils. Refilling is easy-simply pull out the empty cartridge and replace with a new one. Refill cases contain two pencil cartridges.