These brown plastic starting blocks stay put on any clean floor without the need of glue or pins. The 3¼"W pedals are easy to move after use, making setup and breakdown as easy as a warmup lap. This model of Blazer's starting blocks is uniquely made for indoor use and will not damage the facility's surface. Its lightweight construction makes them easy to transport and store when not in use. While these blocks are sturdy, it is recommended that a second person supports the units with their feet from behind.