9.3 by 7 cm. According to Alibaba official website, the size of acrylic swing music is 9.3 by 7 cm, and the acrylic swing music is a humanoid ornament. Acrylic, also known as PMMA or plexiglass, comes from English acrylic (acrylic plastic) and its chemical name is polymethyl methacrylate. It is an important plastic polymer material developed earlier, which has good transparency, chemical stability and weather resistance, easy dyeing, easy processing and beautiful appearance, and is widely used in the construction industry.