It is an instrument consisting of a curved wooden arch (hazel or chestnut), and a rope net (flange) in spider web in the middle. The ball is not hit but relaunched with force
(this is crucial difference between Xare and raquetball, it is like Joko Garbi,
CUT AND PASTE
an ancestor sport of Jai Alai where it looks like they are hitting the pelota with the cesta, a la Remonte, but they are actually catching and throwing very quickly. The torque of the webbing of the xare is what makes it so whippy and fast.)
This specialty was originally practiced by Basque religious who exported it to Argentina. A game opposes two teams of two players, and is played only in a trinquet.
Length of the Xare is between 22 1/2 and 23 inches. Pelota weighs 2.75 to 2.9 ounces. Haven't found circumference or diameter of pelota.
A Trinquete court is the about 95 feet long (about as as long as a basketball court). I think it is about 30 ft wide. Not sure about that.
Front wall begins 31 inches from ground, is about 28 feet high. Side walls are about 16 1/2 to 19 1/2 feet high. Also, as you have seen, has a right wall, so it is a 4 wall sport. There are two different height walls on the front left in front of the dugout. So you have 3 wall shots high and low. There is a curved bevel between right and front wall that allows for interesting angles. There is also a dugout on the left. As you have also seen, the roof of the dugout is in play. Balls hitting the netting in front of the dugout on the fly or bounce are direct points in Main Nue (handball). Not sure how this works in Xare. Watch closely and see who serves next. I think if it hits netting on the fly it is a foul but on the bounce a direct point. The dugout wraps around the back wall and its roof is in play also. No netting back there and, in Main Nue a pelota that goes in there is a direct point. Don't know how works in Xare. I think they have a glass wall in front of that dugout. Again, keep a close eye on who serves next. Front court serves like in Jai Alai.
A great source, whether you read Spanish or not, is:
El Xare: La Raqueta Argentina, by Pablo Ubierna, publicly available in .pdf format at: