Image Item No. Description  77808  Brick, Round 1 x 2 with Hollow Studs and Open Center with Bars Catalog: Parts: Brick, Round  68325  Brick, Round 4 x 4 with Recessed Center and Hole Catalog: Parts: Brick, Round  65138  Brick, Round 4 x 4 x 2/3 Dome Top with Hole Catalog: Parts: Brick, Round