Using the roller is and effective. After placing the diamonds on the canvas with your diamond pen and colorful clay, use the roller to gently press down on the diamonds. This ensures that each diamond adheres properly to the adhesive surface, preventing them from falling off. The roller is designed to work seamlessly with different tools, making it a versatile addition to your crafting kit. Features -Color:Assorted Color -Material:Plastic,glue -Size:4.00X2.50X1.20cm/1.57X0.98X0.47in -Size:8.00X2.50X0.20cm/3.14X0.98X0.08in -This versatile tool is compatible with numerous accessories, providing you with unmatched flexibility for your creative projects. -The vibrant clay wheel adds a to your diamond pens, enhancing the visual appeal and variety of your . -Crafted from sturdy materials, this tool ensures durability and performance, ensuring it remains effective for extended use. -Its user-friendly design makes it ideal for beginners, allowing even those new to to use it with ease and confidence. -By enabling more precise and polished artwork, this tool significantly improves the overall quality of your diamond art pieces, making them stand out. Package list: 5 clay wheels + 2 clay rollers