Google Promotion Service RIM is the short name for Reaction Injection Molding. When your prototype required quantity is more than 50 pieces and dimension is larger than 1000 x 800 x 300 mm, RIM molding can greatly help you to reduce unit price of each prototype. The biggest advantage of RIM molding is that prototype can be different wall thicknesses and the maximum wall thickness can be 10mm, which Urethane casting and Plastic Injection Molding don’t have. Reaction Injection Molding principle video Reaction Injection http://www.leecheer.com/google-promotion-service/