Specifications:
Gasket for watch back case
Teflon Watch Gasket O-Ring 27-39mm Gasket 
for Tissot T063 T035 1853 T099 T028 T41 

Dimension calculation formula is as follows:
Inner diameter of watch case=inner diameter of waterproof ring+thickness of waterproof ring X2


Package Include:1 xGasket 

Product name：Gasket
Type:Round
Material: teflon
Color: Red
Thickness: 0.6 mm 
High:0.9mm
Application：Watch parts
 
Available Size
Internal diameter :27.5-39mm
Gaskets are suitable for the back cover of Tissot watches, but these are not made by Tissot and do not carry the Tissot logo. They are replacement accessories, not copies. 

Features:improve the waterproofness of the watch, and also have the role of dust proof.
Notice:
1、Pls allow 0.01-0.2mm error due to the manual measurement,pls make sure you do not mind before you bid.
2、The color may have a liitle different as the difference display,pls understand