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About product and suppliers:
            8,391 obs products are offered for sale by suppliers on Alibaba.com, of which medical ultrasound instruments accounts for 12%, plastic auxiliary agents accounts for 6%, and coating auxiliary agents accounts for 3%. 

A wide variety of obs options are available to you, 

There are 8,444 suppliers who sells obs on Alibaba.com, mainly located in Asia. The top countries of suppliers are Philippines, China, and Pakistan, from which the percentage of obs supply is 1%, 94%, and 1% respectively.