Princeton Catalyst wedge series are the stout cousins to the Catalyst Blade series. Catalyst wedges, reminiscent of potters ribs, are hand tools that are designed thick on the heel end and taper to a slightly flexible edge on the working end. Made from a special silicone rubber, Catalyst wedges can withstand just about any environment it is exposed to whether it be clay, oil or acrylic paint and, cake frosting. Yes, catalyst is catching the eye of cake decorators as it is food and dishwasher safe. Just keep your cake wedges and clay wedges separate. Each of the Catalyst Wedge six unique designs measure approximately 4.5" wide, 3" high and, about 0.5" thick at the heel.