Product details, positive and negative aspects, and ingredients or materials of a hand rest for nails are not mentioned in the search results. However, some of the search results provide information on the safety and efficacy of nail products, including nail polish, nail polish removers, and artificial nails. These products may contain chemicals that can affect worker health, and using them can expose nail salon workers to chemicals. It is important to read product labels and SDSs and follow manufacturers instructions when using all nail salon products, including those labeled as "free" of hazardous chemicals. SDSs may not contain all of the information needed to adequately protect oneself, so it is important to take additional precautions, such as wearing impervious gloves and goggles when handling and transferring products. Additionally, it is recommended to use metal trash cans with tight, self-closing lids to keep the nail products soaked on cotton balls and other trash from evaporating and getting into the salons air. Finally, it is important to ventilate the room to remove chemicals in the air, as ventilation is the best way to lower the level of chemicals in a salon.