Univen mixer beater beater set Compatible with Oster 900 series and Regency Kitchen Centers 900 series are models with a service number which begins with a 9 Includes one round and one square beater Quality part by Univen, a family owned American business Univen mixer beater beater set. Compatible with Oster 900 series and Regency Kitchen Centers. 900 series are models with a service number which begins with a 9. Includes one round and one square beater. Quality part by Univen, a family owned American business.