Feature: 1. • Made of premium Metal material with strong wear resistance, dust-proof capacity, and exact durability. 2. • The bearing is an 8-ball shaft that effectively reduces friction resistance for delivering smooth looping performance. It helps beginners learn looping and basic string tricks. 3. • 10mm-long M4 screw features high toughness and neat threads, with good ability to maintain, and strong effect in connecting objects. 4. • Specialized design, exquisite craftsmanship, and excellent quality. 5. • After-sales Service Guarantee:  Any problem, please contact our store without hesitation. Honor to serve you! Specification: This set includes an 8-ball shaft and an M4 screw of 10mm length. Made of premium Metal, they possess strong wear resistance, dust-proof capacity, and exact durability. Feature: • Made of premium Metal material with strong wear resistance, dust-proof capacity, and exact durability. • The bearing is an 8-ball shaft that effectively reduces friction resistance for delivering smooth looping performance. It helps beginners learn looping and basic string tricks. • 10mm-long M4 screw features high toughness and neat threads, with good ability to maintain, and strong effect in connecting objects. • Specialized design, exquisite craftsmanship, and excellent quality. • Any problem, please contact our store without hesitation. Honor to serve you. Specifications: M4 Screw Main material: Metal Color: Black Size: Length: 10mm; diameter: 3mm Bearing Main material: Metal Color: Silver Size: out diameter: 13mm; height: 5mm; inner diameter: 7mm Package Information: Package size: 3.5 * 2 * 1cm Package weight: 8g Polybag packing. Note: * There could be a few deviations due to manual measurement or slight color difference owing to photographing condition. Thank you for your understanding. Packing List: 1 * M4 Screw 1 * Bearing Package List: 1 * M4 Screw 1 * Bearing