Round bowls are made from a variety of materials, most commonly: plastic and polypropylene, stoneware, melamine, glass, and recycled PET (often noted as 60% or 80% recycled PET). Some models also include silicone components (for lids, seals, or bases).
Many round bowl sets include tight- or clear-fitting lids and are designed to nest or stack for compact storage. Product listings often specify the number of lids included and whether lids are paired with specific bowls for storage convenience.
Stay‑put features include suction bases with quick‑release tabs (common on toddler bowls) and nonslip silicone bases or elevated nonslip designs on mixing and storage bowls to help keep them steady during use.