3led round caster introduction

1. round shape 76MM diameter
2. flashing color:led white color
3. OEM/ODM are warmly welcomed
4. Function:a switch at button to activate fast-blink, can flash when weight
5. 2*CR2016 batteries(included) and can be replaceable
6. Design with full of elegant and noble and high quality.
7. Customer's unique logo can be printed on it
8. waterproof design can put in the water
9. good seal performance