The products are of good qualities and are sold at competitive prices .

The exetemal of this product is made of nylon material without any air pores.

It is anti-dust 、anti-water 、anti-oil /emulsion and anti-chemicals .

the nylon leather is use for the exterior and pvc plate and steel supporting ring for the exterior and pvc plate and ateel supporting ring for the in terior .it can work properity within a temperature range of 110°c and -40°c.