These cutters are designed for use in clay - polymer, metal, airdry etc. They can be used to cut, impression or texture clays. Using your cutters: As with all cutters, especially the small ones, clay can sometimes stick inside the cutter, this is inevitable but it is advised to dip your cutter in water or a soapy sponge before you use it, this will act as a release agent. You can also use cornstarch in the same way. How to purchase: Choose your individual size requirements from the drop down list or purchase the full set of 7 cutters at a reduced cost. These cutters are pre order- they are made once order has been placed. Currently 2-3 working day processing time. Care Instructions: Not dishwasher safe To clean please remove excess clay with damp cloth then wash in standard washing up liquid. Store out of direct sunlight or hot conditions as they can warp with too much heat. To visit my main shop click here : https://www.etsy.com/uk/shop/KalyandKlay Clay Cutter Leaf Organic Sharp Edge Jewellery Makers Polymer Tools UK Spring Shape