Dropper material

HI again ..
I was concerned about using all glass bottles for my MMS1 , CDS , HCL , DMSO and even MMS2

YO AVOID ANY POSSIBLE REACTIONS .

I transfered my mms from plastic bought original packaging bottles to the glass bottle , with glass dropper ( but the head or bulb is black im not sure maybe silicon ) as it was on the website under pharma and food grade dropper .

And the other reason is that I want to get equal drops from both bottles .. and this was easy with a dropper .

Now the question is :: is it safe to have it in a glass bottle n glass dropper with this head material as i couldnt find any better quality than a glass dropper and it comes like this .

I have read somewhere that DMSO as a solvent must not come in contact with rubber bulbs incase of using a dropper ..
Is silicon safe ?
I will attach my bottle