$8
https://www.amazon.com/gp/product/B075FV78W8/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
5 stars on amazon
It came with 5 inside (2 thick and 3 thin), I used 2 thin guards. It has also a nice case
pickup 1651 page mill rd
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