RAKU TOOL SB-0470 (apricot, 29lbs/ft3) – is a polyurethane board for styling and master models. It has a very good surface structure and is easy to machine. Precision Board Plus™ PBLT-15 (low temperature, 15lbs/ft3) – is a rigid, high density urethane, (HDU), tooling/modeling board designed for prototype machining, water jet cutting