<https://www.offgridsports.com/shop/accessories/off-grid-30mm-trident-g10-kiteboard-fins-set-of-2/#webpage>
<http://schema.org/description>
"Set of four 30mm symettrical kiteboard fins with 316 grade stainless steel M6 screws"
<https://www.offgridsports.com/shop/accessories/off-grid-30mm-trident-g10-kiteboard-fins-set-of-2/>