ETER® Multi-Purpose Floating Buoys View all ETER® Multi-Purpose Floating Buoys products here. ETER®Multi-Purpose Floating Buoys – RD Series (Cylindrical) RM222 ETER®Multi-Purpose Floating Buoys – SC Series (Flat-Top) RM234 ETER®Multi-Purpose Floating Buoys – RB Series (Two-Ears) RM34