4 PackElecrainbow LED Badminton Shuttlecock For Outdoor Sports Activities at Dark Night Switch inside in the cork with very easy ON/OFF button Package Dimensions: 7.3 x 2.5 x 2.5 inch; Package Weight:60g (7g/piece) Materials: Quality Goose Feather + Cork Ball Head + SMD LED Built-in economical fastener battery backup; No need to be replaced 4 pack of economical shuttlecocks in various colors;Targeted for beginners and amateurs playing in any dark environment