Silicone Baking Mats, Set of 2

It is 29.5 × 42 cm, the size of a standard half sheet tray. Measure the flat base of your tray; if it is smaller, the mat will ride up the sides.

Don't. Cutting exposes the fibreglass mesh at the edge. Choose a tray it fits instead.

Yes. The set is two identical grey bordered mats, 29.5 × 42 cm each, with the same printed ring pattern. Use one per tray for a double batch.

They are piping guides. Pipe macaron shells or drop biscuit dough inside the rings and every one comes out the same size with room to spread.

Roll each mat loosely with the printed side out, or lay them flat under your baking trays. Folding leaves a crease that never quite goes.