PRODUCT DESCRIPTION: 1. Product size: Trumpet: 21*4*0.85 Large: 25.5*4*0.85 2. Type: Universal 3. Applicable models: Universal 4. Product weight: large size: 200g small size "170g 5. Color: P4 bracket-gray (small) + P4 felt bag-small, P4 bracket-silver (small) + P4 felt bag-small, P4 bracket-gray (large) + P4 felt bag-large, P4 bracket-silver (large) + P4 felt bag-large, P4 bracket-pink (large) + P4 felt bag-large, 6. Material: aluminum alloy 7. Load-bearing: large size: 20kg small size 15kg feature of product: 1. Aluminum alloy material, more suitable for notebook 2. The triangular support is stable and does not shake, improving your working state 3. Ultra-thin folding, more convenient to carry 4. Three colors are available, gray silver, more suitable for the value of the notebook 5.8 Gear adjustment (large 8 gears, small 6 gears) 6. Hollow design, worry-free cooling 7. The buckle is non-slip 8. Fold the buckle to block all kinds of laptops with different edges 9. Multi-size compatible