We have a variety of frost top and cold slab units available, including a drop-in frost top made of stainless steel and granite. It features a thermal mastic heat transfer compound and a 1.5" deep trough around the perimeter with a 3/4" stainless steel drain. The unit also has an on/off switch and self-contained refrigeration with R290 refrigerant and a 1/5 HP motor. It requires a cutout size of 30-3/4" x 25" and is cUL, NSF, and UL certified.