The PEEK is injection molded first and then sent to the second supplier who molds silicone rubber 'ribbons' on to the PEEK part. There are a few holes in the PEEK part that will be rubber filled. This is to make sure we do not rely only on the bond between PEEK and rubber.

You may know this already but: Injection molding PEEK is a bit different from most thermoplastics in that you have heat the mold quite a bit.

I hope this helps.

/Martin