Micro Rings for hair extension attachment, Plastic coated aluminum rings without inside screws. 

Color available: 
Black, dark brown, brown, light brown, dark blond, blond, light blond, auburn, burgundy, 

We have small, medium and large size for your choice. 
The following is the specification 
Item out diameter inner diameter length 
Small size micro ring 3.5mm 2.0mm 3.0mm 
Medium size micro ring 4.0mm 2.7mm 3.0mm 
Large size micro ring 4.5mm 3.0mm 3.0mm 

We have 2 different package. 
One is bottle, 1000PCS/bottle 
The other one is jar, 100PCS/jar. 
Minimum quantity: 1000PCS/bottle 
Each bottle contains 1000 aluminium long tube micro rings. This product is for hair extension attachment.