Shamrock Cutter What is a shamrock? Meaning of Irish symbol explained and why the On St Patrick S Day, the Irish Shamrock, a Green Clover with Three Golden Irish Shamrock Clover. St.Patrick 's Day Stock Illustration. These Shamrock Cutters are so shamrock & roll! Available in 8 different sizes that can be purchased separately or in sets. Sizes are measured across the longest widest part of the cutter. Please see pictures that provide a visual of the measurements: 8mm 10mm 12mm 15mm 18mm 20mm 25mm 30mm Cutters can be purchased in the following sets: Trio Pack 10mm, 20mm, 30mm Full Collection of 8 sizes 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.