Authentic OEM Herman Miller BB Casters, Case of 70. These BB casters are perfect replacements for your worn chair wheels. These casters are part of a large lot of stale inventory from an authorized Herman Miller dealer. Price is for all 70. With its double-wheel construction, the 2.5-inch Standard Carpet Caster is perfect for use on low- to medium-pile carpet or with a chair mat. Fits most Herman Miller chairs including Aeron, Embody, Sayl, Mirra 2. 2.5-inch Standard Carpet Caster. This listing is for all 70 casters. Perfect for a Herman Miller repair shop or a reseller. These are new, original wheels.