Specification: Material: Spring steel and plastic Size: 42cm x 8.5cm (Lenght x Width) Maximum Tension Length: 1M Suit For: 4-16 years old students Color: Red, Black, Blue Weight: 320g Features: Improves complete upper body strength Great for toning or building your kids chest and arms Using carbon steel tension spring and it can be disassembly,dynamics can be adjusted as you like. Package Included: 1 x Spring Exerciser Ships in 7 business days. It is shipped from China. Delivery is provided by China Post Air Mail. Delivery time depends on the couriers, local customs in your country also holidays, weather conditions. Usually it takes from 39 to 60 days, depending on the customs at your country.