The ER-14 comes standard with a 10–degree plastic caster blocks. Now with these optional 7 and 10-degree blocks, the total caster can be adjusted to suit your track conditions. The caster blocks come with two holes for camber link locations in order to offer a wider range of setup adjustments. The caster blocks are made of SWISS 7075 T6 aluminum and black anodized. These caster blocks also increase durability and rigidness.