Stainless Steel Icing Syringe Design Cake Probe The Icing Syringe design handy cake probe is a quick and effective means of ensuring that your cakes are fully cooked. Simply push into the cake and remove; if the probe comes out dry then your cake is cooked. If it comes out covered with wet mixture then it needs to stay in the oven a while longer. The probe is made from Stainless Steel. The Probe Measures 16cm long