I do not recommend business with Professional Acoustics Co. for the purchase of PAC International Products (RSIC-1). Their standard (non-wavering) return policy is a 20% restocking fee. This equates to $46 for a single box containing 25 acoustical clips. I tried to discuss options with them, but they were unwilling to budge. They lost $154 dollors of current business and any repeat business over $46. Despite my need to purchase additional clips, I will be taking my business elsewhere and suggest everyone else do the same.