PME calyx floral cutters, S/M/L set of 3 (CA505). ABS thermoplastic. Official sizes: small 23 mm (0.9"), medium 33 mm (1.3"), large 40 mm (1.6"). Official materials: sugar paste (rolled fondant), petal paste (gum paste), marzipan, and craft clays. Flat-top cutters; official page lists rolling a pin over the back for a clean cut. Specs from PME's Floral Cutters - Calyx page.

Three calyx cutters. The green bit under a sugar flower.