This shell is designed for children's athletics, sports, regular schools, and personal use. Vortex usage: In throwing training As a gaming equipment Material: PU+EVA Dimensions: 30cm total length, 8.5cm diameter at the widest point, 16cm head length, 14cm tail wing length Weight: 120g. Feature: During the flight, a whistling sound of "dropping bombs" will be emitted, increasing or decreasing according to the flight speed 1 Meticulous workmanship: The meticulous design, perfect in workmanship, durable and long service life 2 Intellectual function: This educational toy can cultivate children's vision, hands-on ability, cognitive ability, coordination ability and parent-child communication 3 Colorful design: The product adopts colorful design, which is in line with children's mind and children would love to play 4 Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away 5 Safe material: The product is made of EVA material, which is safe and environmentally friendly, and children can use it with confidence