slap bracelet       
noun [ C ] uk/ˈslæp ˌbreɪ.slət/ /ˈslæp ˌbreɪ.slət/ (also slap band, /ˈslæp ˌbænd/ /ˈslæp ˌbænd/)
 (啪一按可以扣上的)金属手环
a long, flat piece of covered flexible metal that closes around your wrist with a short, sharp sound
  The company supplies lanyards, slap bracelets, and other customized promotional products. 公司供应挂绳、手环和其他可定制的促销产品。 
 Style yourself with these super cute kids' slap bands. 用这些超级可爱的儿童手环来塑造自己的风格。 
 - More examples
 - Nowadays bracelets are classified into sports bracelets, charm bracelets, bangles, and slap bracelets.
 - Slap bracelets were banned in several schools after reports of injuries.
 - Slap bands are a low-cost yet effective way to promote your brand.