Our Buzzing Bee Cutter set is available in 9 different sizes. Sizes are measured across the longest/widest part of the cutter. Please see the Buzzing Bee Cutter page for a visual of the measurements: 10mm 12mm 15mm 18mm 20mm 25mm 30mm 35mm40mm Note: When using our Buzzing Bee Mirrored Cutter Set we recommend burnishing your clay and/or dusting your cutters with cornflour as required so the clay doesn't stick to the imprint. For a demonstration of clay stamping techniques please watch our tutorial here. Material: PLA plastic, a biodegradable thermoplastic polymer. Colour: Colour will be at random and is subject to availability. Use: Please see our page "Cutter Use and Care" for tips on getting the perfect cut. Care: Please do not put MyClayCo cutters in the dishwasher. The material may warp if exposed to high heat. Please see our page "Cutter Use and Care" for instructions on caring for your cutters.