The overall ratings of four Durable Goods stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Skullcandy Inc. (NASDAQ:SKUL) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Skullcandy, Inc. is an audio brand that reflects the collision of the music, fashion and action sports lifestyles. . The stock price has fallen 14.9% over the past month, worse than the 2.1% increase the Nasdaq has seen over the same period of time. As of Sept. 28, 2012, 40.2% of outstanding Skullcandy Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of SKUL stock.

Tupperware Brands‘s (NYSE:TUP) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). Tupperware Brands makes and sells storage containers for the household. The stock also gets an F in Earnings Growth. For a full analysis of TUP stock, visit Portfolio Grader.

Tempur-Pedic (NYSE:TPX) experiences a ratings drop this week, going from last week’s D to a F. Tempur-Pedic International is a global manufacturer, marketer and distributor of premium mattresses and pillows. The stock also gets an F in Earnings Surprise. Wall Street appears to agree with the stock downgrade, with share prices dropping 5.5% over the past month. For more information, get Portfolio Grader’s complete analysis of TPX stock.

This is a rough week for Cavco Industries (NASDAQ:CVCO). The company’s rating falls to D from the previous week’s C. Cavco Industries designs and produces factory-built homes, which are mainly sold to a network of retailers throughout the continental United States. The stock receives F’s in Earnings Growth, Earnings Momentum, Earnings Revisions, and Margin Growth. The stock has a trailing PE Ratio of 55.50. To get an in-depth look at CVCO, get Portfolio Grader’s complete analysis of CVCO stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.