plastic referee whistle 1 material: plastic 2 colourl: 6 colours 3 size: standard 4 use: referee item professional plastic referee whistle1 item name: referee whistles2 moq: 2000 pcs3 size: 53*20MM4 colour: black,red,blue,green,yellow,orange,etc5 material: plastic6 parts: metal key ring,cord7 logo: printing logo is available8 use: for referee, promotion,sports9 sample : free10 feature: without ...