Thanks for sharing the info on your development process. It looks like the DC Blocks are still the only plastic jerk blocks out there!

Admittedly, the Original (19″ x 15.5″ x 2″, 10.5lbs) is small for jerk blocks, but work great for pulling blocks. This size was meant to be very portable, durable, and versatile in function, as nothing like this existed 10 years ago when I invented them.
The robust character from a special blend of recycled HDPE, LDPE, XPE allow for rigidity and flexibility so that they do not fracture or dent.

Since these are compression molded vs injection molded, the production cost are not as cheap as one might think. Personally, I priced these at a fair price and back in 2010 cheaper than my competition for pulling blocks and their prices actually came down, or became “on sale.”

The big expense is the aluminum mold. Once I could afford one, I made a second product: the Double-Wide with dimensions of 31″ x 19″ x 2″, 23lbs). They fit on top of two Originals placed side-by-side. I still wanted to make them lightweight and versatile. The reason I came up with the Double-Wide was to offer a portable jerk box. Standard jerk boxes need dedicated space, and space of often a premium. Also, larger professional athletes prefer a larger size.

With the use of XPE (cross-linked polyethylene) I have been able to recycle and use this type of plastic which cannot be melted or made into something else. So far, I have keep 1,000,000 lbs of plastics out of the oceans and landfills during the last 10 years.

I do not have a product with rounded corners, because it would be too expensive to make and the market for these is just not there. While DC Blocks Originals are great for plyometrics, I have always maintained that there are products more appropriate for maximal height jumps and will defer to those products if one is to see how high they can jump upon.

First Place! thanks.

Derrick Crass
Olympian 1984/1988 – weightlifting