Our principal raw materials are carbon and stainless steel and aluminum flat-rolled coil, sheet, plate, prime tin mill, pipe and tube that we typically purchase from multiple primary metals producers. The metals industry as a whole is cyclical and, at times, pricing and availability of metals can be volatile due to numerous factors beyond our control, including general domestic and international economic conditions, sales levels, competition, levels of inventory held by other metals service centers, producer lead times, higher raw material costs for the producers of metals, imports, import duties and tariffs and currency exchange rates. This volatility can significantly affect the availability and cost of raw materials to us. During 2022, metals prices decreased 57% throughout the year, whereas during 2023, metals prices decreased 45% from April to September and increased 66% from October to December.
Similar to many other metals service centers, we maintain substantial inventories of metals to accommodate the short lead times and just-in-time delivery requirements of our customers. Accordingly, we purchase metals in an effort to maintain our inventory at levels that we believe to be appropriate to satisfy the anticipated needs of our customers based upon historic buying practices, supply agreements with customers and market conditions. Our commitments to purchase metals are generally at prevailing market prices in effect at the time we place our orders. We have no long-term, fixed-price metals purchase contracts. When metals prices increase, competitive conditions will influence how much of the price increase we can pass on to our customers. To the extent we are unable to pass on future price increases in our raw materials to our customers, the net sales and profitability of our business could be adversely affected. Declining metals prices, customer demand for lower prices and our competitors' responses to those demands could result in lower sale prices and, consequently, lower gross profits as we use existing inventory. Significant or rapid declines in metals prices or reductions in sales volumes could adversely impact our ability to remain in compliance with certain financial covenants in our credit facility, as well as result in us incurring inventory or asset impairment charges. Changing metals prices therefore could significantly impact our net sales, gross profit, operating income and net income, and could impair or adversely impact the carrying value of any of our assets.