<br>4 Pieces D-cell battery holder series or parallel physical science plastic D size battery case physics D battery holder <br> <br>Specifications: <br>Product name: battery case <br>Color: blue <br>Material: plastic and metal <br>Fit battery type: D size battery (not included) <br> <br>Package contents: <br>4 x D-Cell battery holders <br> <br>Warm notices: <br>Children who are too small should use it under the supervision of an adult. <br>Please be patient when you install the battery into the holder. <br>This battery holder for D Cell batteries are made of high impact plastic and suitable for heavy classroom use.