1). Rotational Molding , one piece & seamless. 2). Food grade LLDPE, non-toxic. 3). 2.3'' ... electrical equipment when they are being transferred.2) The solid, one-piece seamless double-wall polyethylene(PE) construction surface can be easily ... -molded) technology ensure impact resistance and long-term durability.2) One-piece, seamless construction, have no seams to fail, leak-proof.3 ...